I don't play it as much but I used to play alot of Reaper.

I just got Overwatch 3 days ago and i seem to be good with Tracer, i havent really tried anyone else though.
I play on PC

I play comp a lot so i can't really main anyone, but my favorite character at the moment is sombra, since this meta is all dive, shes very nice going around and hacking dva, so that she doesn't eat any important ults.

And i play on xbox

Like Roadhog or Mei.

I main Mercy, Reaper, Pharah & D.Va.
I play on Xbox One.

Since Overwatch came out, I've gone through multiple mains. The start of the game my mains were D.VA, Lucio and Soldier. Since Season 3 and onwards, my mains have been in this order by playtime (comp and QP) Widowmaker, D.VA, Genji, Reaper and McCree are all tied on playtime, followed shortly behind by Mercy. Zen is slowly creeping up behind Mercy as Discord Orb on the Dive meta is fantastic. Sombra is another one that I may start to main, as she is the Dive counter and can act as a secondary healer. Her damage isn't great, but that's not what she's for; a lot of people play her wrong then bitch that she'd underpowered.

Prefer to play on PC as I can't imagine using a controller for FPS games ever since I switched years ago.