User blog comment:Xilinoc/Ch. 599 - Too Early To Win, Too Late To Know/@comment-4822693-20141004225027/@comment-5398287-20141005035721

Driscoll became more powerful as he killed more beings, which is unique among the series I've read.

As for more powers, the superpower wiki that keeps getting linked around here seems to prove that there are many, many more abilities Kubo could make epithets grant. Remember, pretty much all of them are centered around a basic, pre-existing power (e.g. fire manipulation, mind control, general superhuman powers) with a possible twist (e.g. The Superstar, The Love, The Zombie).