1- The ones competing to be long range burst damage dealers (snipers):
- Widowmaker, Ashe and Hanzo.
2- The ones competing to be close range burst damage dealers:
- Doomfist, Tracer, Reaper, Genji and Echo.
3- The ones that are damage spammers:
- Hitscan: Mccree, Soldier and Bastion
- Projectiles: Pharah, Junkrat, Torbjorn, Hanzo, Echo and Genji.
4- The “utility” ones:
- Sombra, Mei, Symmetra and Torbjorn.
Some characters have hybrid niche: Hanzo, Echo, Genji, Torbjorn.
I guess these ramifications and their hybridization tell something about DPS viability.