Rike is one of Jorg's Brothers.
Rike is a notably large and bloody minded member of the Brotherhood, who seems to be both primarily and exclusively motivated by gaining loot, not even being motivated by Jorg killing his brother. Rike is quite simple and when pressed the only redeeming quality for Rike that Jorg can think of is "he's big."
"Many men do not look their part. Wisdom may wait behind a foolish smile, bravery can gaze from eyes that cry fright. Brother Rike however is that rarest of creatures, a man whose face who tells the whole story. Blunt features beneath a heavy brow, the ugly puckering of old scar tissue, small black eyes that watch the whole world with impersonal malice, dark hair, short and thick, bristling across the thickest of skulls. And had god given him a smaller frame instead of a giant's packed with unreasonable helpings of muscle, weakness instead of an ox team's stamina, still Rike would be the meanest dwarf in Christendom" -interlude between chapter 10 & 11 in King of thorns.