Piccolo would be a good Purple Lantern bacause he started off the reincarnation of evil then developed a soft spot for Gohan who he trained and as indicated in the picture above sacrificed his life for. He did seek power a little bit like most shonen heroes but he was always concerned with the welfar of his adopted home planet Earth.
Red Haired Shanks from the world of One Piece would be a very good Purple Lantern in my opinion. Even though he is hugely important in the balance of power of the pirate world, he was prepared to sacrifice his life to save a little boy he barely knew.
Now it's your turn to speak Norms!
Haha, thanks Geordie Green Lantern. Today I approve of: compassion.