Fordim, you know you just want all the screaming fangirls.
If I got to be an extra... I'd be... Well... I'd love to be someone who got to fight. Not an Elf though. I'd get my costume dirty, and they'd yell at me. I'm thinking a Rider. Just imagine charging with all those people through those fields...
Or a pretty Gondorian girl. Perhaps a healer's assistant, or one of the flower-tossers.