Folium figurae equi pro equestri - loco simpliciter militis tuis in eum.

The horse spritesheet for cavalrymen - just put your fighter on it.

Oh cool, a horse. It makes a nice change from Goku with a wig 😀
Be careful though with the sizes of the mini stand and mini walk poses. It should 50% of the original size. Otherwise, your horse will look like a giant horse in the background compared to the other fighters.

Your horse is 18x16 pixels, so the mini size should be 9x8 pixels:

Thank you for that tip. I was thinking about smaller horse before, but I decided proportions are not so important. And I was wrong, I see.