Callum is fiercely loyal and passionate. He's known around the school for casual flings and short-term relationships, but when he falls in love, he falls hard. He can also be fiercely protective and jealous, especially when he feels like someone is trying to come between him and the object of his affections. Callum is a Tsundere of sorts, and often shows affection by teasing and annoying his crush instead of being outright affectionate.