Badass/Fan Works

Supetastic 6 Unlimited as a whole in Super Milestone Wars 2
The Tamers Forever Series has several examples but Chaos, Rika, Takato, Takeru, Tatsu and (as it is later revealed) Terriermon are by far the most noticeable examples.
In The Tainted Grimoire, characters are this, be they good or evil, for example Judgemaster Cid Randell, aka the strongest man in Jylland, Illua who showed some of her power in the first chapter and Ensei Rou, who defeated 120 mages, without taking any damage.
Light and Misa in Gods of This New World but especially Misa who gets up and keeps fighting the Big Bad after being stabbed in the chest with a sword. Also L pilots a harrier jet and Sayu fights off Mello when her Gun Fu skills when he tries to kidnap her in an Offscreen Moment of Awesome.