It's not stupid at all. I'm already working on a Chopin cosplay and I haven't even touched the game. Back when Tales of Symphonia first came out, I hadn't played it yet but I immediately fell in love with Zelos' character design and cosplayed him even before the game came out in North America. It ended up that Zelos turned to be my favorite character in the entire game, but even if he wasn't I wouldn't have regretted it one bit.
And Rika, I'm cheering for you to be Beat because I think you'd make the cutest freakin' Beat ever >D!