Kosmo

Kosmo the Revenant
Kosmo is a great tank/damage dealer with a good arsenal area of effect abilities, taunts and knockbacks.

With his massive sledgehammer he stomps his enemies and facetanks everything with his overheal from attacks. If you like feeling like the strongest guy in your team and kiting around big bosses whilst taunting them, then Kosmo is just what you want.

In-game description:"Valentin Ulyanov was the EVA cargo specialist on mission SSV35. Dead in space, he was found decades after by the Corporation. Hard as a rock, Kosmo is no friend of subtlety. But if you need a skull cracked open, he's your man."

Abilities
You can find further details on his skills here.

Stats
Kosmo ranks as the strongest hero with a default life at 10,000 HP.

He has no armor or shield.

You can find further details about the different kinds of defense here.