You'll gradually see his stickers art style grow sharper and sharper, as it's more fitting for him
This "mode" as I like to call it, is when he's so enraged he goes ballistic, on a killing spree
It rarely happens though, and takes a lot of pushing to get him to this point
Also showcases his shadowport ability, which is where he can go into a shadow, hide in there, or come out of another shadow anywhere in the universe

Also his actual species is called Shadows funnily enough. Not named after him however, and his name isn't really Shadow if you wanna get down to it, he just forgot his real name and goes by Shadow now
His actual name is Shiro, which is a mix of Shadow and Ira, as he is the Shadow Realm Ira