Faramir

While Faramir is a grown character and, logically, "should've gotten over it by now," Denethor's scathing treatment of him makes it almost impossible for anyone not to sympathize. This factor, combined with a couple of scenes present in the Extended Editions, helps explain why Faramir initially decided to capture Frodo and the Ring, which is the opposite of how he behaves in the novels. It's also notable that the favorite, Boromir, actually admires and defends his younger brother, and is fed up with their father just as much as Faramir is.

Example of:
The Un-Favourite