What are some examples? Off the top of my head, Cus D'Amato said that Mike Tyson was his Sonny Liston. Cus taught Tyson the peek-a-boo style he taught Floyd Patterson and Jose Torres, but he wanted Sonny's power, aggression and bullying attitude from Tyson.
Floyd Patterson's Peek-a-boo style and speed
Sonny Liston's brutal punching power and rage
Joe Frazier went in detail in his book on how his trainer Yank Duram made him watch countless tapes of Rocky Marciano and Henry Armstrong because of the relentless pressure they put on their opponents. When you watch Joe closely, you'll see that he really IS a true combination of both.