Ascended to Higher Plane of Existence: His fate after being freed from Riddle.
Badass: He is one of the toughest Level 4 Magicians ever known.
Berserk Button: Hurt either Rukia or Sora (especially Rukia), and he'll kill two people by now. No kidding.
Beware the Nice Ones: Subverted. From the fact he is pretty much a Jerkass in his true side, he is basically wasn't really nice from the beginning.
Big Brother Instinct: Anything happens to Rukia. You'll be dead by now.
Break the Cutie: He is the first one getting a Grief Monster, though given the reveal, he is really broken.
Crazy Jealous Guy: For Sora. He even threatens and almost killed Satoshi because of it.
Although, it's subverted. As he is a Crazy Jealous Guy for Satoshi.
Dark And Troubled Past: His father disappeared when he was young plus the fact he gets constantly abused by his older sister. No wonder he was so broken before The Reveal.
Deadpan Snarker: Has shades of this. Most notably in his "True" side.
Demonic Possession: He gets possesed by Riddle after his death. Although, he keeps fighting on from the inside.
Despair Event Horizon
Disappeared Dad: His father gone missing when he was still 5.
Expy: His appearance is similar to his Game Counterpart. Plus he has few traits of Rika from Higurashi, most notably their "True" side, though he goes both of it back and forth. Not to mention, part of his true side personality are veeeeryy similar to a certain black-haired anti-hero (aka Vanitas) from School-Side Chronicles.
Go Out With A Smile: He does it twice. First when he dies saving Roku from an attack meant for him. And the second one happens after Roku Mercy Kill him and Riddle, freeing him from the latter's Demonic Posession.