Uehara Amari
First-person pronoun: "ore"
Calls you by name
Lacks self-confidence and always takes a humble stance
Has a "handsome mode" and is a smug, cool-type character
A hidden yandere who is unaware of it; will use any means—self-deprecation, guilt-tripping, and more—to keep the one they love from leaving
By chance, Amari ran into a certain person and secretly developed feelings for them. After being rejected by that girl, he completely fell into darkness, and now takes out his frustrations on you, relying on and acting clingy toward them, asking, "What was wrong with me...?"
He can switch between modes at will
He considers you his only friend