Tankred
Tankred is a SPESS MEHREEN from the 40K Comic Damnation Crusade who, due to horrific injuries, must spend all his time in the metal shell of a Dreadnought. He is a member of the Black Templars. Originally a feral tribesmen named Raclaw, he took up the last name of his first mentor, Brunner Gerhart, after the latter got killed by Eldar. After being mortally wounded while slaughtering a mob of Chaos Space Marines, his second mentor, Tove Skeld, had him placed in a Dreadnought in account of his martial skill and zeal. His endurance is legendary. He has been seen together with Fenix and has a rivalry with Grandfather Dreadnought. Fun fact: Tankred probably comes from the Germanic name "Tancred," which means "well thought-out advice," and was, appropriately enough for a Black Templar, the name of a Norman leader during the First Crusade, Tancred, Prince of Galilee. Tankred is (subtly) mentioned in Imperial Armour 2's recent revision as Ancient Tahncred.
Donovan, a Chaos Dreadnought working for the Iron Warriors, has repeatedly claimed to be the superior Dreadnought, but in every confrontation between the two thus far, Tankred has won by default.