Lica is a single core "innocent"-type and Mitel is a dual core "Battle Innocent"-type, so he has 2 set of wings and split personality. Dual core is cores of identical twin merge. Big represent the dominant personality, small submissive personality. But Mitel's submissive personality is trying to take over, so he slowly turns into "Battle Wicked", where the colours switch. It is hard to explain, hehe.
The type colour is white [innocent], silver [fair], black [wicked]. In their world, silver is most attractive and most common, because if has best form both sides and not split personality. Multi Core, all silver [Pure Fair], is seen as super attractive.