1. "Waaaah!" sounds great! And as for the Japanese, I think I'll go with "Gyaaaah!" since it rhymes with "Waaah!" and "Oi" doesn't look too great when you make it "Oooooiii!!!"

Thanks for all your help! Um, would you like a short fic in return? Just give me a prompt and a series (anything from my interests is fine). Be warned, it might take me a while to write. >_