His name is Error and he’s a mute. In order to talk, he uses his magic to show emoticons. Why not words, you ask? Well, because every time he’s tried, his mind goes too fast to read or it gets jumbled or he gives information he’d rather not share. Emoticons are just easier (and safer) for a secret-keeper like himself.
My sister asked what his favorite game was and I said Cards Against Humanity because he has no poker face and it’s an easy game to play while showing emotions (because I’d like him to show many emotions).