The Christmas Carol Book Tag!
I tend to forget nice characters easily. Heck, I forget a lot of characters easily but for some reason, nice characters never stay in brain for long. As of the moment, I can only think of one character that'd be at the top of Santa's "nice" list, and she is Aria from the Under the Never Sky trilogy. She was such a bitch in the first book but I still remember thinking, "This girl is really nice!" in the second and third book. I especially enjoyed her character development and she's easily likeable and friendly to the people around her.