Mono

Like most other characters in the series, Mono rarely speaks. Instead, his personality is shown in his actions, and it was stated in an interview that Mono is protective, particularly towards Six (Or your oc). Mono appears to be a confident, well-meaning boy who is willing to go out of his way to help others, as shown when he persists in freeing Six from her apparent imprisonment in the Hunter's cabin and offers his hand to her. He stays by her side, offering his help again when she asks for it despite her initial rejection of his assistance. He has a degree of compassion, being very clearly disturbed by the decaying bodies in the Hunter's house, as well as initially being shocked upon seeing Six in her monster form when he finds her in the Signal Tower.