ok by series...
Shikamaru (genius and overall badass, as well as lazy which is just cool haha), Uchiha Itachi (insane abilities, Mangekyou Sharingan, best older brother and hero to the end)
Gaara (insane powers, badass, great character development)
GRIMMJOW JAGGERJACK (straight up badass, one of the sickest hollow features by far [the half jaw], cool hair, awesome powers, and ressurecion reminds me of wolf link)
Zaraki Kenpachi (INSANELY powerful, reiatsu-suppressing eyepatch and KENDO, sick hair too)
Ed (overall amazing at fighting and alchemy, clever, funny, gotta love those angry outbursts at comments on his height)
Greed (Ling Greed too, sick powers and appearance, great character development right til the end)