I'm not agains mixi it up and as such what I'm going to say can either be taken as an insult or an offense and maybe even as stating the obvious but:

I would presume  that for the sake of balance of the game Knightmon corresponding a Champion level digimon displays power akin to such.

As for character, I think He is starting to come together (at least in my mind) probably using yellow as main color, dark gray/ black as secondary and something like purple as accent (isn't that what it is? I was never really taught anything about colors in school). ( as far as for characters ) There are also other details but I think it's just shaping and as such rapidly changing.

I'll probably get back to ya'll later but if I won't get anything up during the day I'm very busy today till evening.