Genjis hard to learn. A lot of people ply him but they honestly suck as him. Unless ur a diamond+ genji, ur bad in my eyes
Genji or doomfist
I would agree with everyone in this comment sections as well but I feel hanzo is pretty difficult to play pretty good with
I would say Doomfist is hard to master and be utilized well until u have a certain mastery in it. Also Wreckingball because the mechanics of that ball is very different from other characters.