there are a lot of them, but Jason Todd. if you don't know who he is look to the following...
Jason Todd, second robinninja and trained under batman. he was killed off in the comics when the joker beat him then put him in a building with a bomb. Jason was the brought back to life.some say he was Hush for a little but filled with hatred for the joker for killing him and batman for not taking revenge he became red hood, a character that the joker was before he was the joker to piss him off and annoy batman. which brings us to who he is now.
My favorite characters are Roxas and Xion from Kingdom Hearts, Allen from Dgrayman, Zidane Tribal from Final Fantasy 9, Mukuro from Reborn, Chrome from Cluster Edge, Merry Nightmare from Yumekui Merry, Aladin from Magi, and...and...I think that's enough. I don't remember some otherscrying.
For the attractive characters... I gotta say Zidane, Nana from Tripeace, Allen, Nura Rikuo from Nurariyon no Mago and Len and Rin(If they count).
The strongest characters would be Sinbad from Magi, Kyrie from Sands of Destruction, Luffy(When he's finally pirate king.), and Master Xehanort( This dude has like 15 versions of him self!)
Naruto and Ichigo tend to annoy me. They really do in a strange way.