Dragon Ball Z, Season 9

Piccolo:
(to Videl) Your father is a hero. He took it upon himself to journey to Majin Buu's home and fight him on his own ground. For reasons we don't know, Mister Satan did not fight Majin Buu. Instead, the two forged a friendship. Your father is the only human being Majin Buu seems to appreciate. Although other circumstances brought it to a halt, your father nearly made Buu adopt a life of peace. He may have transformed into this evil entity now, but Buu still has a potent memory of a man and the kindness he showed a monster. Your dad will never have the powers that we do, Videl. But, his compassion exceeds any victory he could ever achieve in the ring.