Maybe this will help you a little, you can do what I do using paint for this, just go changing the colors of the character color by color using the eraser as follows:
Sorry if you did not understand well, that's because I speak Spanish haha, it's the simplest way with a tool that we all have
Thanks hq, I give you the reason in everything you told me ... When I uploaded the sprite I saw a couple of errors but I did not have time to correct them, and, I sincerely did not want to wait one day more haha ... I like the sprite with The corrections, the color change makes it look better, so, its amazing, thank you again.
Thanks for commenting graphicus, that is a weak part of mine I have to admit, now these days I upload an animation!
I did few animations so far, one of picoro, gray, bomberman, and I do not remember how many others but counted with the fingers of the hand haha ... I'm going to start practicing more my animations
As always, thanks for commenting, I really appreciate it!
Nice sprite of tyrannomon!, the only thing that would be to arrange the model to match more with the original (claws for example), but in general good progress.