Biba Amatori is a 22-year-old elite leader famous for hunting Kabanes in the world of Kabaneri of the Iron Fortress. He stands out with his pink slicked-back hair and striking looks. Though admired as a hero and called the “Liberator” by his people, Biba hides a cold and harsh side. He was cast out from his powerful family and became the renowned commander of the Hunters. His story is filled with twists, betrayal, and revenge—especially against his own father. Biba’s actions, secrets, and experiments involving Kabanes and Kabaneri shape the fate of everyone around him, making his journey a mix of hope, tragedy, and shocking truth.
- Birthday: December 6
- Blood Type: A
- Age: 22
Biba Amatori is a handsome young man with long, pink hair styled back in an all-back look.
His elegant and noble appearance always makes him stand out.
He is often dressed in uniform as the leader of the Hunter Squad, looking both strong and composed.
Biba is admired by both his followers and regular citizens for his bravery and leadership.
People call him the “Liberator” because he leads the fight against the Kabane monsters.
To Mumei, he is a life-saving older brother figure, and she calls him “Big Brother.”
But deep inside, Biba is actually very cruel and enjoys hurting others, especially those who go against him.
He smiles coldly when he kills those who betray him.
Biba wasn’t always like this—he was once honest.
But his father's fearfulness twisted his personality and made him harsh and unforgiving.
He teaches Mumei to be merciless, telling her that “the weak have no right to live,” and makes her give up her real name.
Biba Amatori is the eldest son of the Amatori family, who rule as shoguns from the fortress city, Kongoukaku.
His father once disowned him.
Biba now acts on his own, commanding the Hunter Squad, an independent unit fighting the Kabane.
He pilots the mobile fortress, Katsujo, through many regions, saving people and destroying monsters.
He is a hero to the masses, but has a dark and secret mission of his own.
Biba is a skilled fighter and brilliant strategist.
He is fearless in battle, often leading from the front.
He works closely with scientists to research both the Kabane and Kabaneri, trying to master their powers.
He secretly hides a huge blue-white Kabane heart within Katsujo; where he got it remains a mystery.
With Mumei
Biba is Mumei’s savior, treating her as a sister figure.
He saves her life and forces her to give up her real name, calling her only “Mumei.”
He teaches Mumei to become cold and strong, but this hurts her emotionally as the story goes on.
With His Father
Biba’s relationship with his father, Amatori Okimasa, is filled with betrayal.
His father’s cowardice led to Biba’s suffering and exile, and caused Biba’s harsh change in personality.
With Others
Biba has many followers in the Hunter Squad who admire him deeply.
However, many people also try to kill him due to his reputation and dangerous actions.
The Hero Everyone Admires
Biba becomes the leader of the Hunter Squad, fighting the Kabane monsters and protecting people.
He pilots the Katsujo through battlefields and is cheered as the “Liberator.”
Secret Science and Experiments
Biba teams up with scientists to secretly research how Kabanes and Kabaneri work.
He keeps a gigantic blue-white Kabane heart hidden inside Katsujo.
The source of this heart remains unknown.
He wants to use this knowledge for his own goals.
Twisted Training for Mumei
Biba rescues Mumei and demands that she abandon her true name, becoming “Mumei” forever.
He teaches her to think that only the strong deserve to survive.
The Mystery of Betrayal
For ten years, Biba searches for the person who betrayed him during a past mission.
He finally learns it was his own father, Amatori Okimasa, who left him behind out of fear.
The Plan at Iwato Station
Biba sets his plan in motion at Iwato Station.
He acts like he’s been captured by the crew of the Iron Fortress so he can see his father again.
When they meet, Biba secretly uses a blade with Kabane blood to infect his father and turn him into a Kabane.
He uses the chaos that follows to incite the soldiers and successfully kills his father.
Biba then spreads false rumors inside Kongoukaku, throwing the city into confusion.
Creating Chaos and Tragedy
To break down Kongoukaku’s defenses, Biba injects Mumei with blue liquid, turning her into a weapon called Nue.
He continues to drive the city to panic and destruction to fulfill his revenge.
Final Battle with Ikoma
In the final episode, Biba tells Uryuu to let the soldiers live and goes to fight Ikoma in a fierce duel.
It is revealed during this fight that Biba himself is also a Kabaneri.
At the end, Mumei pierces Biba’s heart, killing him.
Right before he dies, Biba shoots Ikoma with a bullet containing white plasma instead of regular blood.
This saves Ikoma from fully turning into a Kabane, allowing him to keep his mind.
- Biba lost his original name when he forced Mumei to do the same.
- Through his actions, he changed the fate of the Amatori family and Kongoukaku forever.
- He is both a hero and a villain, loved and hated by those around him.
- “Let us destroy Kongoukaku, the fortress of cowardice, and bring true freedom!”
Biba Amatori’s tragic story shows how being betrayed by someone you trust can change you forever.
His life is a mix of glory, pain, and big secrets—making him one of the most unforgettable characters in Kabaneri of the Iron Fortress.
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