Mattie adores Prussia! He's one of the older nations, along with England and France, who Mattie considers a 'parent' figure even if Prussia may not be the best influence (like France is either but oh well :P ). Mattie believes the best of those he looks up to as well though, and he really respects and admires Prussia since Prussia's been around the block so to speak and Mattie's still so young in comparison. And of course, Mattie just loves that Prussia has ALWAYS noticed him and never mistaken him for Alfred, which means the world to him ♥