[Gwaihir the Windlord]

also have a theory that the ring was a separate character in lotr.

Yes, it would perhaps appear that the Ring was a concious, thinking being. However I do not believe it was that, but simply a great power of malice, if you understand me. It was more a 'force' than a being. Maybe the reason it apparently wanted to make it's way back to Sauron was because it was drawn there by Sauron's own malice, or because he was it's creator, rather than because the Ring thought and planned it's way there.

I don't think that Frodo was such a good ring bearer because he was a hobbit. I think that a lot of hobbits could have had a resilinece to the ring but my theory is that it was because they are simple.

I don't know about simple. Simple, to my mind, means unintelligent; this was certainly not so. Hobbits were rather down-to-earth people, and 'couldn't be doing with' (hehehe... that's a rather rustic one from my county of birth) magic; also they did not desire power or dominion but only a good life and peace.