Rose

She is a magitech maid automaton, typically seen tidying and wandering the dungeon in her in-game configuration.

In the television anime adaptation, her waist unit features four insertion ports used for direct energy injection during Speed Charge.

She is intensely devoted to her master Takuma Sakamoto and prone to vivid, romantic delusions.

Strongly cautious by nature, she initially adopts a combative stance toward Rem Galleu and Shera L. Greenwood.

In Cross Reverie, she patrolled and cleaned while guarding the lowest floor of the dungeon Takuma Sakamoto created, acting only as a non-combat AI.

In the other world, she gains self-awareness, recognizes herself as independent, and can act autonomously.

She is powered by magical energy and can refuel passively by staying close to Takuma Sakamoto, or actively via Speed Charge that injects magic directly.

Her combat strength is extraordinary, one-shotting a Large Black Dragon with her Magimatic Soldier, a feat that places her around a warrior-type level 150.

The Magimatic Soldier she operates is the Black Zeronos, a Gelmed Empire model once fielded before a compatible pilot was found and now considered obsolete.

Master: Takuma Sakamoto, whom she formally acknowledges after hearing his account handle "@Diablo-13" and to whom she is deeply attached.

Companions: She begins wary and confrontational toward Rem Galleu and Shera L. Greenwood but can cooperate after recognizing allegiances.

She initially failed to identify her rightful master, but fully accepted him after he stated the formal account name "@Diablo-13".

A Large Black Dragon she defeated had previously overcome the over-level-100 holy knight Geibalt, underscoring her superiority when piloting Black Zeronos.

Within the Gelmed Empire context, Black Zeronos was deployed embedded in machinery prior to matching with an appropriate operator, contributing to its later obsolescence.

Speed Charge is her emergency refueling method that injects magic directly; the anime depicts this via finger insertion into four ports on her waist.

The source description provides no verbatim quotations, but she is known for reverently addressing her master by his formal handle.

In-Game Role

She guarded the lowest level of the dungeon Takuma Sakamoto built in Cross Reverie, where she simply cleaned and wandered without combat capabilities.

Awakening in Another World

After crossing into the other world, she develops self-awareness and the ability to act independently, along with immense combat prowess.

Recognition of Master

She does not initially realize Takuma Sakamoto is her master, but upon hearing the official account name "@Diablo-13" she recognizes and accepts him.

Confrontations and Allies

Her strong caution leads her to meet Rem Galleu and Shera L. Greenwood with a fighting attitude at first, before easing once trust is formed.

Charging and Maintenance

She draws magical fuel by remaining near Takuma Sakamoto, and when depleted, performs Speed Charge to inject magic directly, as shown with the waist ports in the anime.

Battles

Her pilotage of the Black Zeronos lets her defeat a Large Black Dragon in a single strike, surpassing foes that even an over-level-100 holy knight like Geibalt could not beat.

Franchise context: How NOT to Summon a Demon Lord, where her anime depiction highlights the Speed Charge via waist ports.

Terminology notes: Magimatic Soldier is also known as Magi-Matic Sol; Cross Reverie is the MMORPG setting where Takuma Sakamoto created the dungeon she once patrolled.