Butro is a mutated male Monarch Butterfly Kaiju. He is an emperor among his kind, holding the title of Emperor of Monsters, and is related to the legendary Mothra. Butro possesses four massive wings and a host of powers: he can regenerate, secrete corrosive green slime from his mouth, and use specialized tips on his legs for healing. While generally calm (his eyes are gray by day and blue by night), his eyes turn a menacing dark red when angered. He's popular enough to be shipped with shimo.