There are little streaks of blond in his messy brown hair, which he tends to keep short because it gets thick and annoying if it's left to grow out. He has a fair skin tone, and burns relatively easy if he's in the sun for too long (not the Dome sun; that one doesn't bother him). At around 5' 7", he's not exactly tall, but he can at least reach most things.
By now, Calan really doesn't remember where he came from. He thinks he was born in Aquila, but he's been wrong about instinctive things like that before, and may have been from somewhere completely different. He hardly remembers having a family, mostly there are just vague ghosts of memories left, like a particular scent that he remembers, or a short melody or a colour that's notable to him, but beyond that he's got nothing. Neither does he know how long he's been a part-blood, but in the end that doesn't matter much.
He's never been particularly dangerous or notable for that matter. It seems like most in the Tower forgot he was even there at all, and mostly that's been to his advantage. Calan's been left to his own devices for the most part, and he likes it better that way. It means there've been fewer truly abusive handlers he's ever had to deal with, and really, he's one of the lucky ones and he knows it. He's never honestly made friends, either, generally preferring not to get too invested in other part-bloods and Losrians, though he doesn't foster a bias against Losrians.
Eventually, as everyone always does, Calan ended up assigned to a handler that had little interest in being a handler, and more interested in the wealth such a position could command. And Calan, like the guy's other three part-bloods, was set to fighting in the HoloArena in Pyxis. It was probably the most intensive thing he'd been set to doing in a very long time, as while he'd been across the Char and through the Tiernan Wood, they hadn't really done anything. The Arena became a good opportunity for him to refine his battle abilities, because what else was he going to do?
He's spent the last few years surviving in the HoloArena, and most recently, was nabbed by Suyis Lucain himself. Strangely, Suyis doesn't seem to have any interest in giving him direct orders or any idea what to do with himself, and mostly leaves him alone. Calan's glad for this, and also really isn't. On the bright side, Suyis has another part-blood that's as confused as he is, so at least he's not the only one so confused. It's a small comfort, though.