[quote=Asuras]
Gunshin Kyoshuu Demonbane. A mecha so large and powerful it simply breaks the universe it's in and subsequently obliterates other universes simply by brushing against them.
[/quote]

Gurren Lagan breaks galaxies. It also has the ability of fuck-all on it's side seeing as how it's a giant robotic man powered by believing in one's self. So, say. If the guy riding it believed in himself that he could break all reality, that could happen. Also there's the Main character from Zetman who is an instant reset butto. And then there's the Noein, who controls all of space and time.