Oh, for me, Perseus hands down. Between his slaying of Medusa, to overall just being a great warrior and hero, ...to slaying Ceto the powerful sea-monster and claiming Andromeda as his wife, to killing Polydectes with the use of Medusa's decapitated head to turn him to stone...i just absolutely love his story. ---Also, from what i've read, apparently Perseus was the man who mounted and flew Pegasus, though don't fully quote me on that. Aside from the story of Perseus, however, there are just countless amazing stories in mythology...i absolutely love the subject. Good luck and have fun!