I have live split pretty much figured out. But I'm looking for some png files for my splits. (I just need some for the bosses.) but I'm not having any luck in doing so. If any one has ones they are willing to share or a link to where I can get them it would very Welcomed. thank you. (or a general site wouldn't mind getting some zelda or metroid ones also.)

I havent checked for MMX specifically, but i find almost anything i need by using Spriter's Resource, heres a link:

https://www.spriters-resource.com/

If its not a png file, you should be able to easily convert it with paint or another editing tool. Transparency however, would take something else like canva or photoshop

Thanks! I'll give it a look.