Cao Xiu
Cao Cao treated Cao Xiu like a son and even allowed him to live with his own son, Cao Pi. Cao Xiu fought on Cao Cao's side in the various battles against rival warlords throughout the late Eastern Han dynasty. He was also one of the commanders of the elite "Tiger and Leopard Cavalry" (虎豹騎) unit in Cao Cao's army.