If Sin City counts as a Tarantino movie here, it would bring some serious contenders.

Marv is one tanky monster of a man, Elijah Wood's character is insanely fast, that Katana women seems formidable as well. Comic book humans tend to be tougher than action film stars.

If Sin City doesn't count, I'll go with Beatrix Kiddo or one of her oponents. She has done the most outlandish stuff on the list.