Okay, I did the same thread in the Azumanga Daioh guild I'm in, but I thought it would be fun to do a Death Note version.
Basically, you find a song which suits a particular character, then post them singing it.
Something like this... Sing with me L, Light, Matsuda!
L: lalalalala
Matsuda: lalalalaaa
Light: LAAAAAAAAAAA!!!!! *breaks glass with scary high voice*
Of course it doesn't have to be a group. They can sing solo too. But I'll post one or two examples to start you off.
Feel free to post a link to the song if you wish!
Previously Osaka Eats Your Grandma. Decided that it's more fun to be inflatable than eat Grandmas.