Talk:Firebending/@comment-4816926-20120421235906/@comment-12.124.130.110-20120424145419

most likely Iroh or possibly Zuko (Zuko most likely eventually learned how to generate lightning, as his only block was his inner turmoil, which he overcame)

the only other possible teachers were Ozai (who lost his powers), and Azula (who went insane)