riven mains 

riven mains are toxic players that blames everybody for the mistakes he or she did usually a bronze 5 noob who doesn't know how to play and reports everyone for ganking and making a small mistake most cancerous people in the entire game most rivens mains are corrupt

Riven : LEE SIN WHAT THE FUCK ARE YOU DOING COME AND GANK ME YOU PIECE OF SHIT
Lee sin : Alright I am coming top
Riven : YOU NOOB WHY DID YOU DIE YOU FED MY LANE GG WP GET GOOD NOOB
Lee sin : But you didn't help me you sat under turret and I did everything right
Riven : STFU NOOB GET GOOD /ALL REPORT LEE SIN FEEDING MY LANE TROLLING TOXIC NOOB DOESN'T KNOW HOW TO PLAY SHOULD AND HE MUST BE PERMA BANNED 9X REPORTS PLEASE
Example of a riven mains

riven mains by Whydoidothisreasonpls October 30, 2017

Riven main 

Riven mains are known to go in 1 v 5 and die quite a lot. They also complain about canceling one auto-attack when they get first blooded in top lane.

Enemy First Blood Announcer: *First blood*
Some random player: "Is that a Riven main?"

Riven main by Tahm Kench's husband January 29, 2019