For LoTR, most role ideas I had (pre-edit) were listed after the original post, but I had a couple different ideas just based on first impression whatnots, and thought I'd add a few that were missed.

Ent: Jimmy, for reasons obvious to many, and other reasons only obvious to me, nyah :p One hell of a thinker, obviously. Oh. And don't piss her off.

Gimli: coffeebot, for some reason. Like I said, first impressions. I'm not one to live by them, but these are my ideas anyway. Here, I think to myself, is someone who'd love to live in a cave.

Legolas: I'd love to stand on tiptoe and moo here, but I'm too green to be such an important Elf.

I'm reserving Tom Bombadil (book only) for mooself anyway. Always seemed vaguely related to Ents, and full of useless knowledge and a touch of well-meant know-it-allism. Hallo.

I'd give Gandalf to YOOM, what with the mystical origins and barely-concealed immeasureable power...

And I definitely agree with HPF as Aragorn.
I moo, therefore I am.