Here are the top 10 most played heroes for each skill tier as of the start of Season 9 (3/1/18)
Bronze
D.Va
Mercy
Junkrat
Moira
Reinhardt
Soldier: 76
Lucio
Genji
Roadhog
Ana
Silver
D.Va
Moira
Mercy
Junkrat
Reinhardt
Soldier: 76
Lucio
Genji
Roadhog
Ana
Gold
D.Va
Moira
Mercy
Reinhardt
Soldier: 76
Junkrat
Genji
Roadhog
Lucio
Ana
Platinum
Moira
D.Va
Mercy
Genji
Reinhardt
Roadhog
Ana
Zenyatta
McCree
Soldier: 76
Diamond
Moira
D.Va
Genji
Mercy
Roadhog
Zenyatta
Ana
McCree
Tracer
Reinhardt