I like this idea. Are you talking about a Hetalia game or an original storyline with original characters, something completely separate from Hetalia?
Either way, I'm very interested in helping =)
I'll pretty much do whatever is needed--I write and draw and make music particularly =)
There's a fan-made Hetalia RPG in production, and I'm not the main person in charge of it, but I'm working on the music and doing some art for it. I've completed about 9 tracks for the OST so far, so if you wanted to check out my music, you can hear them at my youtube channel: http://www.youtube.com/user/HeroicPlights?feature=guide
You can also get see some of my art at my DA: http://malsavaidity.deviantart.com/
(I've improved compared to the older art I have there, I hope =/ )
I'm a pretty serious writer too, but I haven't really posted anything recent online.
I can work in your parameters if you have something specific you want (a song for a specific part or art to illustrate a specific scene or character) or I can just work from scratch. I love to create, so I'm totally jumping at the chance to be a part of this ^^