Arhu is very much a teenager, hormones and interested in girls. He's clever, had an extremely traumatic past which he's accepted and moved on from (But doesn't really like humans much), loves food, cares a lot about his friends and considers his being a wizard and the oath to protect and help extremely important, and has precognition.

Chii Doesn't have a soul.

KOS-MOS ...Ahaha, right, this is complicated. Spoilers: [