Riju Kaneko

Riju is a cool, diligent girl, but in the heat of competition, feels like a whole different person. Under that chill facade, she is highly intense and aggressive, and often finds that she gets lost in the moment. When someone squidbags her, she can't help but seek them out and revenge squidbags them back. 

If she was characterized by someone who played Splatoon, she would have been playing the games since Day 1 and never missed a day.