These are stolen/recolors of actual sprites/ I can see at least 5 that are directly taken from the Mega Man/Mega Man X franchise.
It's a shame because I was using these before. Now, I have to remove them all since it is a lawsuit waiting to happen.
No telling what other stuff you have claimed as your own. Recoloring an official sprite or "redrawing" it does not make it legally yours in most countries. :(
Good luck in the future!