You could try seeing if there are Japanese classes at OSU, first. (There is a cosplay group page on Facebook!)
Sometimes the students involved in the Japanese program (language classes/exchange program, etc.) like to run clubs or meet-ups. But this is the anime angle...
If you'd like to meet more video gamers/cosplayers, you could try visiting some of the tech classrooms or the library and see if you bump into any groups conversing about the things you're interested in - it makes for a good ice breaker!