here are some quick information about these species.
dragon koicat: very loyal, prefer calm areas, different belly scales,
abyssal koicat: aggressive/territorial, prefer lonliness, glowing traits
arctic koicat: very fluffy fur, huddle in groups to keep warm, they are stubby,
And no I did not steal the mercat idea from Neko_Kingdom in fact they have many differences. Scales cannot cover the whole body for example scales cannot cover thier whole tail also they cannot have real caudal fins.