How about… he would be a loyal lunar guard who was walking around after Luna permanently enabled the royal canterlock voice on his power armor. Them the zebras finished their fetish and boom went the city; ghoulifying him, merging him with his power armor. He met up with a mouse that became a dragon and implied falloutish shenangians happens. He punches out some cloudships in the final battle, rescues derpy (who with her tongue cut out cant speak) and falls in love with her.