(Doubles are all fine except Demyx))

Low tier kins: -- Xion, Kingdom Hearts

Leatherface/Bubba Sawyer, Texas chainsaw massacre

Amy, Sonic franchise

Catkin

Medium tier kins: -- Aqua, Kingdom Hearts

Marluxia, Kingdom Hearts

Sealkin

High tier kins/Id: -- Nekokin

Angelkin

Bulbasaur, Pokemon franchise

Selfhood: -- Demyx, Kingdom Hearts