This is mainly a Fashion Vs Cosplay fanfiction concept one but with this one it is FashionFrame Vs CosplayWatch

Examples for the pairs

Genji vs Excal

Reinhardt vs rhino

DoomFist vs Atlas

Loki vs Sombra

D.va vs Valkyr and operator.

Trinity vs Mercy

(Why da FUQ do I sense Yandere-ness from this...)

Stalker or Nekros vs Reaper.

Wukong vs Winston

Vauban vs Torbjörn

Banshee or Octavia vs Lucio 

Volt or Nezha vs Tracer

Frost vs Mei

Mcree vs Mesa

Hanzo vs Ivara

Symmetra vs Nova or Lotus

Junkrat vs Ember

And this is all I can think of, I know there more but I can't think a lot though.