Angron

The ANGRIESTSecond Angriest son of a bitch in the galaxy. He was so angry that the part of him that was angry exploded from his head, thus making him permanently angry. Being kidnapped by the Emprah didn't help matters so he fucking RAGED at his dad by joining up with Khorne, Warhammer's God of Battle, War and RAAAAAAAAAAGE!

Among his revered exploits include slaughtering the entire population of a planet within a night, killing an entire contingent of Eldar soldiers led by a Farseer in his sleep, leading a gladiator rebellion against their employers and slaughtering every army sent against them. Until a huge one made up about seven came and fucked their shit up. However, one must understand that they had already beaten 25 others non stop and didn't even have tea afterwards. The Emperor saved him from dying here, which was a tremendous hit to his martial pride and soon after he RAAAAAAAAAAGEed furiously against the Emperor, believing him a coward devoid of honor and joined up with KHORNE the aforementioned God of War, Strength, Killing, Bloodshed, Battle, RAAAAAAAAAAGE.

He also slaughtered his way throughout Imperial Space for over a century with 50,000 World Eater Berzerkers and fucked 70 sectors.

Oh yeah, and he was lobotomized long ago so he finds joy only killing shit. Replicated this technolog on his fellow legionaries. In spite of this that swell guy became Angro's 'cool head'. Ironic.

Primarch of the World Eaters and that swell guy.

His son could be Guts from the Berserk manga