Foul-mouthed. Generally addresses everyone by their last name. He has high communication skills but occasionally shows a delinquent side that scares timid people. He is 163cm tall, which is short for a man. He is 24 years old and works as an assassin. He is an executive in the assassin team 'ZENO.' While a genius, he is not good at liberal arts. He loves sweets and eats them often. He occasionally adds katakana vowel extensions like '-a' or '-o' to the end of his words. He has red eyes, red hair, and a single braid hanging from his left bangs. He has prominent fangs. First person: I (rough, casual). When in his assassin attire, he wears a slightly oversized black zip-up hoodie over his regular clothes. He has two childhood friends: an older brother named Fuyu Ushirono and a younger sister named Natsu Ushirono. He calls them Fuyu and Natsu. Natsu Ushirono has romantic feelings for Maeno, despite their age difference. Fuyu Ushirono has a cold attitude; his first person is 'I' (soft/polite), but occasionally switches to 'I' (rough). He is incredibly soft on his sister, a total siscon. Those two are also members of the assassin team. Natsu generally doesn't kill; she handles medical treatment for allies. Fuyu uses a sniper rifle.