He literally tells you exactly what he is, what more do you want?
I'm so happy Peter Jackson left out Tom Bombadil it was such a delightful pleasure to discover him when I finally read the fellowship of the ring... to answer the question
Tom Bombadil is - my favorite character!!!
Who? Are you talking about Goldberry's husband?
TOM BOMBADILLOOOOOOO
I read this in Andy Serkis' voice.