Those eyes are the only things that still not make him/her look like an heartless being. Intimidating tho...
Anyway! The colors you used are perfect for the warm aspect that he/she is supposed to make you feel.
The proportions are pretty good! Except the legs, they look a bit... big? I don't know if the character have such big tights, but it doesn't make him/her look fast. She/he looks a bit goofy. :0
A saw you also stated "Anger" in the tags, but his pose looks more calm than that. I mean, you could make him/her in a more dinamic pose! Like preparing for an attack or something.
Or if you want to keep the fist pose, you can just emphatise it more!
Talking about the fist, it looks confusing. I don't know if he/she is wearing a glove or something, but those circles doesn't make it look clear... :/
The design itself is pretty good! Nothing to say about that! The helmet looks awesome, I mean, I really like it. :P
I also kinda like the palette of the armor! It's not super exagerated as I normally expect!
By the way, I can just conclude that you have a good mind and fantasy, you just need some practice in poses! Hope to see more original characters like this from ya! ;D