Brant is a... complicated character. He's the fiance of Sophie's deceased adoptive sister, Jolie, whom Sophie has never met. Before Sophie met Brant, he kidnapped her with other members of the Neverseen, a bad rebel group he's a part of.  He is described as having a hollow, empty voice when interrogating her. When she meets him in the next book, he has a raspy voice to cover the fact that he was one of her kidnappers, and to play a broken, devastated, and damaged person after the loss of his fiance in a fire accident, and having been injured by the fire himself. What they don't know yet, is that Brant is a pyrokinetic, and the one who started the fire that killed Jolie and injured him. He joined the Neverseen because Pyrokinetics was a banned ability, and he had to hide the fact that he had this ability. However, because he was branded a talentless for not having an ability, him and Jolie were considered a "bad match," since Jolie did have an ability. Having to hide his ability, and be disregarded and discouraged for being in a bad match really messed him up I think, and thus he is bad.

P.S: Idk if that pic is supposed to be Brant or not, but there's not really a description on what he looks like other than being extremely scarred after the fire (so this would be before the fire), but this image came up when I searched for him, so I'm using it.