TV-Series
Description
Maori Hosoi operates as the dedicated Operator for Border's Ikoma Squad. Hailing from Hyōgo Prefecture, she grew up overshadowed by her accomplished older brothers, resulting in scarce familial praise and a distinct discomfort when receiving compliments. This background contributes to her high-strung and occasionally standoffish personality, creating friction with her squad's typically laid-back attitude. Border scouted her directly into the Operator role for Ikoma Squad.

She possesses a light complexion, short spiky dark hair, and large eyes. Her Trion Body wears the standard Border Operator uniform, notably without the tie. Hosoi engages privately in creative hobbies like novel writing, crafting plush toys, and composing songs, rarely sharing her creations. Her preferences include inari sushi, dandan noodles, flowers, and cute objects. She speaks in a Kansai dialect, matching most teammates. Supplemental materials confirm her nickname "Mario" references the Nintendo character.

Within Ikoma Squad, Hosoi manages four combatants, demonstrating exceptional multi-tasking and information-processing skills. She delivers real-time tactical support during missions, issuing precise warnings on enemy positions, sniper locations, and imminent threats even amid complex four-way battles, maintaining effectiveness despite the high number of agents monitored.

Her squad relationships feature recurring dynamics:
- Captain Tatsuhito Ikoma exasperates her with his nonchalant pre-battle anecdotes and lack of strategy, frequently teasing her by calling her "cute" and using the nickname "Mario-chan," which flusters her due to her aversion to praise.
- Kōji Oki deliberately provokes her discomfort, notably instigating squad-wide compliments after deducing her hidden resentment over Ikoma's inattention; he addresses her as "Mario" without honorifics.
- Kai Minamisawa consistently ignores her tactical warnings, leading to repeated confrontations; she addresses him without honorifics, while he uses "-senpai" for her despite her lower rank.
- Satoshi Mizukami appears subtly attracted to her, offering restrained compliments suggesting concealed infatuation; he also uses the nickname "Mario" without honorifics.

Throughout the B-Rank Wars, Hosoi coordinates her squad across multiple matches. She displays visible irritation when Minamisawa disregards her cautionary advice, resulting in his bailouts, and chastises him for solo engagements. During a critical match against Tamakoma Second and Ōji Squad, her teammates' focus on trivial topics like cafeteria menus instead of strategy heightens her frustration. She remains vigilant during combat, relaying enemy movements and coordinating attacks, such as directing Oki toward Chika Amatori's position. Post-match, she reacts with exasperation to Ikoma's misinterpretations of scoring.

Ikoma Squad participates in several rank war rounds, maintaining consistent mid-tier placements. Hosoi assists in intercepting Galopoula's incursion south of the base. Her operational role remains unchanged through confirmed media, with no documented evolution beyond these events.