You know, I should probally start commenting on other people's work in the way I'd like people to comment on my work. Honestly and wordfully.
KH character:
Tattoos are kind of strange on a hero-type KH character, but if you're gonna have them, make sure they're more visible. You might want to make the sleeves shorter or non-existant so that the tattoo arm bands are easy to see.
I like the belt and the chain, but they should be chunkier. Everything in KH art is large and visible.
The design lacks zippers. All the major characters have outfits that includes zippers, even if they're useless (Donald's hat?). Stick a zipper on the jacket or even the pants. How about pants that turn into shorts when you unzip the extra length of fabric?
The shoes need to be detailed. All of the main characters have very detailed sneakers, sometimes making them really annoying to draw.
Also, brown doesn't seem right for a KH character. Try a flashier color, like yellow or red. Mix them up. Most characters have a large range of different colors in their outfits, even if it's only in the acessories.
A unique symbol (besides the tattoos) would make him stand out better too. Like Sora's crown necklace, or the zipper pull on Roxas's shirt.
Man, now I feel bad.