This is a simple game. Based on the above user's signature, avatar, or whatever, you determine a song that would be fit for their theme song. It can be any type of music, not just Pokemon music.
Person 1: Person 0's theme song would be Pokemon - Double Trouble (Full Version) - YouTube
Person 2: ^'s theme song would be Super Sonic Dance Attack - YouTube
Person 3: The Falcon Punch Song!! - YouTube
And it goes like that.
Just saying, it might be better to just post links to the song instead of embedding videos in case there are people with slow computers.
I'll start. Since there's nobody above me, I'm gonna use the banner. It's theme song would be I'm a banana - YouTube