The Hobbit Ring-Lord?

[Kuruharan]

It is only once he claimed it as his own that this became a possibility, although Frodo was ill-equipped (thankfully) to bend it to his own will. But it does suggest that someone with the power to wield the Ring (Saruman, for example) would have been in a pretty good position to use it against Sauron almost as soon as it came into his possession - provided that he took the precaution to claim it, rather than simply bear it.

I'm not sure it would really have been as easy as all that. Wrenching control of it and then trying to use it against Sauron (or one might say against its own self) would have been a tremendous struggle. The point is hammered at us incessantly that the Ring belonged to Sauron. I don't think this tie was something that could be broken without great trauma to all concerned.

It might have been a very clever trick on the part of the Ring to simply go along with the claimant, and then betray the claimant at some critical juncture.