I would gladly go for saitama of one punch man. This dude has so much super strength that he defeated an alien god without breaking a sweat.
There are also various anime characters who have proven to possess ultimate power of destruction.
These are:
Sage of six paths from Naruto
Son Goku from Dragon Ball
Admiral kaizoku, marshal d teach, Big mama all from one piece.
And many others I can't mention.
Personally I'd go for Saitama from one punch Man as the strongest hero of all time in the history of anime's.