Slumped between Bill, Chuck Greene or The Doomguy.
Bill is a Vietnam veteran who walked across cities surviving against a neverending horde of Zombies and Mutant Zombie varients and it took three Tanks to take him down for good (and Tanks are essentially Zombie versions of The Hulk).
Chuck Greene survived a Zombie outbreak in Vegas (Ok, it's Fortune City, but it's basically Vegas) and took on thousands of Zombies at once by constructing Guitars which explode zombie heads, Chainsaws on a kayak paddle, a Lightsaber and Wolverine Claws on Boxing gloves just by taking two common household items and Duct Taping them together.
The Doomguy survived the Zombies/Demons on Mars and then survived the Zombies/Demons on Earth and blew up Hell itself! Eventually after the Demons attacked Mars again he decided to stay in (what remained of) Hell and constantly fight the Zombies/Demons so that they never invade Mars/Earth again.