Hmm, i'm not sure about solo-ing but TTGL might stand a good chance.
I have never watched it but i get told that it is super strong so i am also going to say demonbane.
I also want to say Satan from Bastard!! but we havent seen any real feats from him yet, all i know is that he has potential to be a universe buster, i guess we will have to wait until the next few chapters of the manga are released
Saint Seiya is to unfair, lol. There armour can tank universe destroying attacks XD
Also I regret saying this as i hate her, but haruhi seeing as she can pretty much do anything, even though she cant control her powers.