[Boromir88]

Oh! Oh! Extra thought, since now I got to thinking on Denethor.

Theoden, is in many ways a redeemed character too. Although, I don't think I would say he even had a character trait (as Inzil mentions with Boromir and Thorin) that could potentially lead to evil.

Theoden's fall was driven by the hand of Saruman and a slimy counselor (I guess you could say poor judge of character? But really that not exactly "evil.") Anyway, Theoden is facing the threat of Saruman, is being held in a decrepit state of mind, his only son and heir dies. Yet he does come out "renewed" and triumphant after listening to Gandalf.

He too dies, although it doesn't appear to be in payment for an act of evil, unless if it's a very very delayed payment. Because again, Theoden didn't do anything wrong other than being a poor judge of who he had as his counselor.