TV-Series
Description
Chika Amatori begins the series as a timid 13-year-old with short black hair, violet eyes, standing 140 cm tall, and possessing blood type A. Her immense trion reserves repeatedly attracted Neighbor attacks, causing the disappearances of her brother Rinji and others close to her. This trauma led her to isolate herself socially, fostering low self-confidence to avoid further pain.

She joins Border as a C-rank agent, later advancing to B-rank with Tamakoma Second as their Sniper. Her uniform evolves from the basic C-rank design to a distinct B-rank jacket featuring holsters, knee-high boots, and the Tamakoma emblem. Interactions with teammates Osamu Mikumo and Yūma Kuga gradually shift her personality from withdrawn to more sociable and determined. She resolves to confront her own problems, stating: "I can't let other people take care of my problems forever. I want to go and search for them myself."

Chika possesses extraordinarily high trion levels, comparable to a Black Trigger, amplifying standard Border Triggers to unprecedented destructive power. Her Ibis sniper rifle shot can obliterate trion fortifications and level multiple buildings. However, an initial mental block prevents her from firing at human or Neighbor targets due to fear of harming others and anxiety about being feared for her power. This limitation focuses her on terrain manipulation during battles, destroying structures to create tactical advantages. She later partially overcomes this block by using Lead Bullet combined with Lightning to immobilize opponents without injury.

She uniquely manifests two rare Side Effects: sensing hostile Trion Soldiers and humanoid Neighbors (detecting their location, speed, and numbers), and erasing her presence by calming her mind, which helped her evade Neighbors before joining Border. Most individuals develop only one Side Effect if any.

Her combat role emphasizes support and strategy. Disciplined and patient, she excels in stealth tactics, often repositioning after each shot to avoid detection. Despite not being a fast runner, she has high stamina and physical flexibility. Mentored by Border agents like Yuzuru Ema, she refines her sniping skills, learning to time shots against moving targets and engage in direct exchanges with experienced Snipers like Kōji Oki. Her growth includes devising independent tactics during missions, such as evading pursuers in Rank Wars.

Chika's vital trion reserves are crucial for Border's operations, particularly powering away-mission ships to reduce refueling needs. Outside combat, she enjoys small animals, children, white rice, and working. Her name translates to "a thousand beauties" or "a thousand excellencies," while "Amatori" means "rain acquisition."