Teezy
Mousefur. She took no crap from anyone, even as an elder, and I liked that, other than the medicine cats, she was basically the one she-cat didn't end up getting a mate and having kits. She didn't have to have kits or a mate to be a strong and successful warrior. Plus, she helped Longtail out a lot, and I liked their friendship.
Oh gosh I forgot about Mousefur. Sensible, not afraid to speak her mind, tough without being a jerk. She was great. I'd definitely put her up there among my favorites. I would love to see a Mousefur Super Edition or something of the sort.
Also I love Blackstar. I found he was one of the few characters in the series that had more grey morality going on in how he was portrayed and grey morality is something I'm always a fan of.