Ok! So here is my pickle situation. Sorry if it's in the wrong spot here! But I wasn't sure where to go.
I LOVE my characters. Oh so much. I try to give each one of my pets an overlay to best represent them. I spent a long while drawing up my Impmon (to go with my pet charlie named Impmon) This digimon means a lot to me in my life and represents my love for digimon on here. I dont want to make drastic changes though I need him to be as genuine as I can go awe. So no wings or silly markings. I can't thibk of anything to change on him besides the color of his bandana (which I always thought of to be blue for me anyways, and his hair tuft which an impmon doesn't have) I could maybe make the bandana a collar or scarf as well?
Here is my overlay idea: 
Now what should I fix up so he's not copyrighted? I already have the hair tuft like I said. And I don't want to change too much on him also. I did not use a refrence I used it straight from memory ahah. Man I watch digimon way too much, and as they come, all the seasons at least 3 times a year since it came out LOL. But I'm so stuck on what to chnage. :c
I don't know much about the char but here are some random ideas:
Hopefully one or more of those helps C:
your best bet would probably be to change his colors completely tbh. atm he looks exactly like his digimon counterpart; the hair tuft is a very minor alteration. c: finding at least four things to change can be really hard when you're wanting to stay as close to your original inspiration as possible, but I can't think of anything else that would put enough of an original spin on him to get him approved. D: