Shadows:
Heart: Mainly survivor's guilt and self loathing. He's lost so many people in his life but he keeps making close friends and worrying over them.
Head: No mind control, possession, or mental illness, but he has trauma from being in three murdergames in a row, plus missing memories. He also died from head trauma once but somehow that's healed up fine? DWRP is weird.
Other: Something's preventing him from speaking more than a few words at a time. He can get around this issue, but he hasn't been able to fix it.
Light: Nope! Just a plain ol' human being.