Rip Tristan

Name: Rip Tristan

Gender: Male

Affiliation: UNDER (Negator-hunting organization), Fourth Seat (Ⅳ)

Series: Undead Unluck

Birthday: September 17

Age: Stated to be roughly one year younger than Latla Mirah

Height: As an adult, “around 180 cm or a bit more”; in his child body, “about 140 cm or slightly less”

Weight: “About the same as Latla Mirah” (exact number unknown; comedically interrupted in the source)

Hobbies:

Collecting eyepatches and bladed instruments

Teasing Latla Mirah

Skills / Specialities:

Dissection and surgical technique

Sewing

Cooking

Pickpocketing and stealthy theft

Favorite Food: Pasta

Negation Ability: UNREPAIR – denial of healing

Main Weapon: Scalpel

Equipment: Ancient artifact prosthetic legs Blade Runner

Voice Actor (Anime): Yuki Kaji (Japanese voice performance)

Rip Tristan is a slender, well-toned young man with short blond hair and a red left eye marked by a beauty spot underneath, giving him a strikingly handsome, almost androgynous charm.

The right side of his face is covered by a large eyepatch decorated with UNDER’s emblem — an inverted “Fu” symbol representing “Un” or negation in their iconography.

Beneath the eyepatch lies a self-inflicted wound across his right eye.

This injury never heals and sometimes bleeds through the eyepatch, which Rip casually licks away, adding a dangerous, sensual edge to his demeanor.

He usually dresses in a black leather jumpsuit–like outfit, tight-fitting and practical for high-speed combat.

During undercover missions, such as infiltrating an underground auction, he has been seen in a dark formal suit, showing he can clean up elegantly when needed.

Both ears are pierced with earrings that contain liquid-filled vials, reinforcing his medical and experimental aesthetic.

Despite his lean build, his body is clearly trained and muscular, suited to the explosive movement required by his Blade Runner prosthetics.

After being killed once in battle, Rip is later revived in a child’s body by the power of ancient artifacts, shrinking his height but not his deadliness.

Even in this smaller form, his expression, eyepatch, and mannerisms make him instantly recognizable as the same dangerous man.

On the surface, Rip Tristan is flippant, flirtatious, and lighthearted, often speaking with teasing humor and appearing unserious.

He cracks jokes even in tense situations and enjoys riling up both allies and enemies, especially Latla Mirah, his childhood friend and fiancée’s twin sister.

Underneath that carefree exterior, however, he is highly intelligent, analytical, and ruthless when needed.

In battle, Rip has exceptional situational awareness, reading the flow of combat in mere moments and exploiting opponents’ abilities with frightening precision.

He is trusted within UNDER and interacts naturally with its international members, even switching languages (such as speaking Chinese) to match his comrades.

At the same time, he cannot understand Japanese, which creates some amusing communication gaps depending on the situation.

He shows a chivalrous streak toward women, often treating them with consideration and gentle concern even if they are enemies.

Yet his kindness does not prevent him from using torture or killing without hesitation when it serves his goals, especially in the context of collecting Negators and artifacts for UNDER.

Rip sometimes refers to Negators he has lost interest in as “it,” dehumanizing them once they’re no longer useful.

He can calmly decide to kill them to transfer or secure their abilities, demonstrating how far he has hardened himself since his tragic past.

This callous attitude enrages Andy, pushing the Undead hero close to unleashing his full wrath.

Still, those who know Rip’s backstory recognize that his cruelty is a self-imposed mask, part of “killing himself on the inside” to keep moving toward his goal.

Latla Mirah understands him deeply and describes him as someone who wants to play the villain on purpose.

In her view, becoming a hero would mean giving up on Leila Mirah — and that is a sacrifice Rip simply cannot make.

Despite everything, traces of his original nature remain: he is loyal, dutiful, and emotionally intense, capable of genuine affection, gratitude, and guilt.

His collection of Un Anno’s manga “Kimi ni Tsutaware” (“Let It Reach You”) after being helped by him hints at a softer inner self that still cherishes connections.

Basic Description

UNREPAIR is the Negation ability that denies healing to any wound that Rip himself inflicts.

Any injury caused directly by Rip (typically via his scalpel or Blade Runner attacks) becomes an incurable wound that will never heal until Rip himself dies.

This denial covers both natural recovery (the body’s own healing processes) and medical treatment, making even minor cuts potentially lethal if placed correctly.

Rip uses this to deadly effect by targeting vital areas like arteries, forcing his victims into inevitable exsanguination.

Psychological Lock: Denial of Treatment

UNREPAIR is more than just a physical curse; it also attacks the victim’s subconscious mind.

Once afflicted, the victim becomes unable to perform any “healing act” on that wound, as if paralyzed by an invisible force.

If someone tries to treat their own UNREPAIR wound with the intent to heal — applying pressure, bandages, or any direct treatment — their body locks up as though bound by a psychic paralysis.

They cannot complete the motion, cannot apply the bandage, and are forced to watch themselves bleed out.

This psychological prohibition can extend to the intent of others depending on how they approach the wound.

The ability hinges heavily on the interpretation and intention in the victim’s mind: if they interpret an action as “treatment,” UNREPAIR blocks it.

The Trap of Explaining His Own Ability

Unlike most Negators, Rip openly explains his ability’s mechanics to his opponents in battle.

At first glance this looks like arrogance, but in reality, it is a deliberate part of UNREPAIR’s design.

If a person both:

1. Receives an UNREPAIR wound, and

2. Learns the ability’s true解除 condition: “Kill Rip Tristan”,

then a new layer of the curse kicks in.

From that point on, any attempt to attack Rip with the purpose of killing him is judged subconsciously as a “healing act” for their own wound.

In other words, “Killing Rip Tristan = Treating my UNREPAIR wound.”

Because treating the wound is forbidden, their body becomes paralyzed whenever they try to attack Rip with the intent to kill him, turning him effectively invincible to that victim.

As a result, once someone is both wounded and fully informed, they may find themselves utterly unable to raise a weapon against him.

Rip weaponizes this by deliberately talking too much, carefully walking his opponent right into psychological checkmate.

Loopholes and Counters

UNREPAIR is not absolute and contains several loopholes based on intent and interpretation:

If a person does not aim to heal the wound, but instead acts with another primary intention, UNREPAIR may not trigger.

For example, someone might attack Rip not to cure themselves, but to save another person, placing that altruistic goal above their own healing in their subconscious.

A victim might choose to sacrifice the wounded area for offensive or survival purposes.

For instance, cutting off the injured limb or body part entirely, treating the action as an attack or tactical move rather than a medical procedure, can help them escape death by blood loss (assuming other factors allow for this).

Rip’s ability also clashes interestingly with other Negations like Andy’s UNDEAD.

UNREPAIR can interfere with Andy’s regeneration by making certain wounds simply not regenerate, but Andy can circumvent parts of the curse by self-inflicted attacks that reframe the meaning of the injury and by using his “bullet body” techniques.

Rip initially believes that once someone’s mind has defined “killing Rip” as “healing,” even a Negator like Andy would never be able to break that mental chain.

This overconfidence becomes a key flaw when Andy uses his own unique mindset and tactics to fight past the constraints.

Activation and Duration

UNREPAIR appears to be always active with respect to wounds Rip inflicts; it does not require conscious activation or consent once the injury is made.

The curse remains in effect until one of two things happens:

Rip Tristan dies, ending the negation on all his victims.

The affected body part is somehow removed or destroyed in a way that bypasses the intent of “healing,” or the victim otherwise circumvents the rules through mental or situational loopholes.

Because the wounds never heal as long as Rip lives, he is effectively a walking source of permanent trauma.

This makes him one of the most dangerous Negators in close-quarters combat and a significant strategic threat.

Blade Runner (Ancient Artifact Prosthetic Legs)

Rip Tristan’s legs are replaced by an ancient artifact prosthetic known as Blade Runner.

These are elaborately decorated golden mechanical legs that grant him extreme mobility and lethal range.

Key features of Blade Runner:

Propulsive Jets:

The soles can eject air with such force that Rip can instantly boost himself, hop between points in midair, and essentially perform sustained aerial movement.

This gives him incredible agility, letting him assault enemies from unpredictable angles.

Flying Slashes:

From the shin area, Blade Runner can launch physical slashing blades, effectively extending his kicks into long-range attacks.

These slashes seem to have real “blade bodies” and can be shaped, combined, and aimed with high precision.

Cross-Shaped Blades:

By adjusting his kicking motion or leg positions, Rip can send slashes that cross into X-shaped or cross-shaped attacks, making them harder to evade.

Combining Blade Runner with UNREPAIR, Rip can move at blistering speed, control distance freely, and inflict incurable wounds from close or medium range.

In practical terms, this makes him a roaming executioner who can weave around the battlefield and kill with a single cut from any direction.

Rip names many of his techniques with moon-themed terminology, paralleling Andy’s own moon-inspired move names.

Crescent

Crescent is Rip’s basic ranged attack using Blade Runner.

He kicks to send out a crescent-shaped slash wave, resembling a bright arc like a thin moon.

Even in his child body, the Crescent wave is large enough to surpass an adult human’s height.

At full power in his adult form, Crescent becomes a swift, wide-ranged cutting field capable of slicing through multiple opponents or obstacles.

Full Moonsault

Full Moonsault is an advanced variation of Crescent.

Rip jumps, tucks both legs together, and rotates in midair, releasing a circular slash that resembles a full moon.

The resulting attack is a gigantic disk-shaped slash comparable in scale to Andy’s devastating “Crimson Full-Moon” type techniques.

It covers a massive area and is ideal for sweeping through large enemies or overwhelming defenses with sheer size and force.

Crescent Rain

Crescent Rain is a combination technique with Latla Mirah.

Rip fires multiple Crescents toward Latla, positioning her between himself and the enemy.

Latla then uses her own ability to alter the trajectories of the slashes, making them fall unpredictably around the target like a chaotic rain of blades.

This technique creates an inescapable storm of attacks with unpredictable paths, extremely difficult to anticipate or dodge.

Even though Latla knows she will not be hit thanks to her own Negation, she is still understandably terrified by the sheer volume of lethal blades passing near her.

Because of that, she is reluctant to use Crescent Rain casually, making it a high-impact but psychologically taxing move for the duo.

Rip Tristan is a core executive of UNDER, carrying the designation of Fourth Seat (Ⅳ).

Within the group, he operates as a combat leader, strategist, and high-value Negator hunter.

His comrades in UNDER appear to trust his judgment and fighting prowess.

He adjusts his communication style to include different languages, showing a certain camaraderie and flexibility with his fellow members.

Rip’s mission in UNDER is deeply personal: he is working with them to obtain and secure the Ark, an ancient artifact capable of enabling loops to the next world or timeline.

His ultimate objective is to use the Ark together with Latla Mirah so they can reach a future loop where they might save or reunite with Leila Mirah.

To accomplish this, Rip is willing to oppose the main protagonists, undermine efforts to kill God, and even sabotage attempts to save the world if they conflict with his own goal.

He has effectively given up on “killing God” and instead put all his hope into the Ark and the next cycle.

Latla Mirah

Latla Mirah is Rip’s childhood friend, comrade, and the twin sister of his late fiancée Leila Mirah.

The two grew up together in a privileged environment, and their relationship is a mixture of deep familiarity, banter, and complicated shared guilt.

Latla possesses the Negation ability that causes any fortune-telling she states as a certainty to turn out wrong.

She unintentionally chose Leila’s surgery date via fortune-telling, which later becomes a source of crushing guilt when the operation goes fatally wrong.

Rip often teases Latla and jokes around with her, making their partnership seem casual and lively on the surface.

However, they share the same tragic burden: they both feel responsible for Leila’s death and have dedicated themselves to undoing that tragedy via the Ark.

Latla understands that Rip has deliberately embraced the role of a villain.

In her eyes, for Rip to become a hero would mean accepting a world where Leila is gone, something he cannot emotionally handle.

The synergy of their abilities and combat skills — especially techniques like Crescent Rain — shows just how close and synchronized they are.

Despite their dark goals, their bond is one of the most sincere and emotionally complex in Undead Unluck.

Leila Mirah

Leila Mirah is Rip’s childhood friend, long-time mutual crush, and formally his fiancée.

She suffered from a severe congenital heart condition as a child, with doctors predicting she had less than ten years to live.

Rip dedicated his entire life to medicine with the singular goal of saving Leila’s life.

Just before her surgery, he and Leila pledged themselves to each other, firmly confirming their engagement and future together.

During the crucial heart operation that Rip himself performed, his Negation ability UNREPAIR manifested for the first time.

The wound on Leila’s heart would not stop bleeding or respond to any treatment, leading to her death on the operating table despite all efforts.

Rip’s entire worldview collapses at that moment, as he realizes his very power was what killed the person he loved the most.

From that point on, Leila becomes the core of his motivation: every atrocity, every alliance with UNDER, and every betrayal of “heroic” ideals is done for the chance to see her alive again in another loop.

Andy

Andy, the protagonist of Undead Unluck and the Negator of UNDEAD, becomes one of Rip’s most important opponents.

Their ideologies and abilities clash sharply: Andy fights to kill God and free humanity, while Rip is focused entirely on reviving Leila, even at the cost of the world.

In combat, Rip’s UNREPAIR directly counters Andy’s regenerative UNDEAD, creating a uniquely tense matchup.

Rip initially believes that once Andy knows UNREPAIR’s rules, he will be unable to break free of them, underestimating Andy’s ingenuity and sheer will.

Their first major confrontation ends with Andy shooting through Rip’s heart, killing him and seemingly ending his threat.

However, thanks to ancient artifacts, Rip later revives in a younger body, re-entering the story and eventually clashing with Andy again over the Ark and the future of the world.

As Ragnarok approaches and the available seats on the Ark become desperately limited, Rip and Andy fight over who gets to board.

Rip ultimately loses this final duel, entrusting Andy with the mission of preventing the same tragedies from repeating in the next loop before he dies for good.

Fuuko Izumo and the Union

During the battle against the seasonal UMA Autumn, Rip temporarily teams up with Fuuko Izumo and the Union, setting aside their previous enmity.

He plays a major role in the strategy and execution of the fight, proving himself to be an extremely capable ally when their goals align.

Through this cooperation, glimpses of Rip’s original self emerge: the compassionate doctor and loyal friend, not merely the cold villain of UNDER.

Fuuko’s influence and the memory of Leila’s words stir his conscience, making him more reflective about what it truly means to “save” someone.

Following his interactions with Un Anno and the others, Rip acquires all volumes of Un Anno’s famous manga “Kimi ni Tsutaware” (“Let It Reach You”).

This detail, shared by Latla, hints that Rip is quietly trying to reconnect with the warmth and hope he once had, even as he hurtles toward a tragic end.

Un Anno

Un Anno, the creator of the manga that shapes the entire world of Undead Unluck, becomes a sort of reluctant benefactor to Rip Tristan.

After receiving help from Un Anno, Rip shows his gratitude in his own subtle way by collecting Un Anno’s work “Kimi ni Tsutaware” in its entirety.

This act suggests Rip respects Un Anno not only as a powerful figure but also as a storyteller who can reach hearts.

Un Anno, in turn, comments that Rip is “someone who is living by killing himself,” capturing his tragic internal contradiction.

Childhood and Medical Prodigy

Rip Tristan was born into a prestigious family.

Near his home lived the twin sisters Latla Mirah and Leila Mirah, with whom he grew up as childhood friends.

From a young age, Rip and Leila shared mutual romantic feelings, forming a bond that would define Rip’s life.

Tragically, Leila developed a severe heart disease when she was still a child, with doctors predicting that she might not live even ten more years.

Determined to save her, Rip made the choice to become a doctor, abandoning the refined hobbies forced onto him — such as piano and painting — in favor of rigorous academic and medical study.

During his student years, he could often be found practicing with a scalpel on thick boards to refine his surgical precision.

Rip eventually obtained his medical license at the astonishingly young age of 18, becoming the youngest doctor in his country.

He gained fame as a “doctor with the hands of God,” known not only for his talent but also for his compassion and devotion to his patients.

At this stage, Rip was bright, optimistic, and brimming with confidence.

He truly believed that with enough skill and effort, he could save anyone — especially Leila.

The Surgery and Rip’s Tragedy

Eventually, the day of Leila’s critical heart surgery arrived.

On the night before the operation, Rip and Leila confessed their love and pledged to marry, promising each other a future after the surgery.

Latla Mirah, a budding fortune-teller at the time, had chosen the surgery date using her divination, believing she was guiding Leila toward survival.

What none of them knew was that Latla’s own Negation — which makes any fortune she confidently declares turn out false — had just locked them into the worst possible path.

During the operation, Rip made his incision on Leila’s heart.

But the wound behaved abnormally: the blood would not stop, and no matter how much he sutured or transfused, the bleeding continued without response.

Despite desperate efforts from Rip and other staff — and despite Latla’s arrival by Leila’s side — they were forced to watch as Leila died on the operating table.

Rip, having built his entire identity around the goal of saving her, was shattered.

Overwhelmed by grief and guilt, Rip tried to commit suicide with his own scalpel.

Latla intervened at the last second, and in the struggle, Rip slashed across his right eye instead.

The cut should have been relatively minor, but the bleeding would not stop, mirroring the fatal issue during Leila’s surgery.

This was when they realized that Rip had awakened the Negation UNREPAIR — and that this power had been active when he operated on Leila, causing her wound to become incurable.

Simultaneously, Latla’s own Negation ability, the one that makes any affirmative fortune-telling fail, had come to light.

She understood that by choosing the operation date and declaring it as the day Leila would be saved, she had unintentionally guaranteed the opposite.

The two of them were thus crushed by a double burden of guilt:

Rip believed he killed Leila with his hands; Latla believed she sentenced her sister to death with her words.

Discovery of the Ark and the Next Loop

In the aftermath of Leila’s death and the awakening of their Negations, Rip and Latla realized that their world is governed by harsh, unseen rules — the very logic of Negation and the cycles orchestrated by higher powers.

Their tragedy was not just bad luck; it was the product of these cruel cosmic mechanics.

Eventually, the pair came into contact with the ancient artifact Ark, a device capable of transporting people to a new world or next loop in the cycle of reality.

The Ark represented a single clear hope: the chance to meet Leila again and prevent her death in another iteration of the world.

Rip and Latla made a joint decision:

They would secure a place on the Ark, travel to the next loop, and this time save Leila from her fatal destiny.

This decision reshaped Rip’s entire moral compass.

He became willing to abandon the idea of killing God, betray the larger cause of freeing humanity, and instead focus purely on obtaining the Ark at any cost.

From then on, Rip cultivated his image as a villain and joined UNDER, aligning with others who were prepared to oppose the Union’s goals.

However, beneath the cruelty and ruthlessness, he remained the same man who once dedicated his life to saving a single person — only now, he was willing to burn the world for that purpose.

During one of his brutal confrontations with Andy, Rip Tristan is shot through the heart, and his life ends.

Yet his story does not stop there, as ancient artifacts bring him back in a child’s body, allowing him to re-enter the conflict and fight again for his Ark-centered goal.

In the Autumn battle, Rip fights alongside Fuuko Izumo and the others, playing a vital role in their victory and revealing a more heroic side to himself.

Through this cooperation and his interactions with Un Anno and Latla, he reconsiders what it means to protect someone’s “life” and what true salvation might look like.

Later, with Un Anno’s assistance, Rip temporarily regains his adult form, restoring his full physical prowess.

Still, his core objective does not change: he has given up on killing God and remains fixated on using the Ark with Latla to reach the next world and possibly a future with Leila.

As Ragnarok approaches and the available seats on the Ark become the ultimate bargaining chips, Rip clashes directly with Andy over who deserves to board.

In a climactic battle of ideals and abilities, Rip loses to Andy.

In his final moments, Rip entrusts Andy with a crucial wish:

That in the next loop, Andy will prevent the same tragedy from befalling Rip, Latla, and Leila again.

With that final request and a measure of peace, Rip Tristan dies — not as a simple villain, but as a tragic man who gambled everything on love and the possibility of a better world in the next cycle.