Without further ado, here we go:
Disclaimer: I'm skipping the expected Favorite Book question because, honestly, I have a couple favorite different books. So, I figured I would mention why some of those books are my favorites in the answers below.
Favorite Character Arc: I have more than one, but the one I'll mention here is Elisa from the Fire & Thorns series by Rae Carson. I reread the series recently when a friend was blogging about how much she loves it, and it reminded me how much I love it, too. Elisa's character arc is fresh and unique, and I love seeing the way she grows. I don't want to spoil the series, so I'll leave it at that :) (and you should go read it)
Favorite Secondary Character In A Series: So....I realize that this is not the answer, but I love love love one of my secondary characters in my current project. Anyway, I think I'll have to say...Karla from BJT by Anne Bishop (I have so many more, that's just one of the first to pop in my mind)
Favorite Fantasy Worlds In Books (Maybe this should be favorite world-building since I would not want to live in these worlds?): Alexandra Duncon's Salvage, Anne Bishop's BJT, Rae Carson's Fire & Thorn series.
Favorite Blog By An Author: Nova Ren Suma's blog (she is also one of my favorite authors).
Favorite Would-Be-Besties: Ronan Lynch from The Raven Cycle.
Favorite Symbol: The Claddagh.
Favorite Drink (aka, I need to go to bed and can no longer give more than a one-word answer): Water.
What are some of your favorites for what I mentioned above?