Glee character theme songs?

Okay well I am trying to create a glee character theme song video to
put on YouTube and some of the characters are difficult to find songs
for.
These are the characters that will be in the video:
Rachel
Finn
Quinn
Puck
Santana
Brittney
Mr. Schue
Artie
Sam
Sue
Mike
Mercedes
Tina
Kurt
Blaine
Lauren
Jesse
And maybe Emma

So if you could give me as many ideas for theme songs as you can that
would be great :)