I adore Agitha. That little giggle she makes whenever you give her a new bug cracks me up.
I also like Rutela (it's beautiful how much she loves her son, such a great mother), Hena (I always have the desire to marry her and live with her in the wonderful Fishing Hole, she has a cool and relaxed personality), Midna, especially her Princess form ("Am I so beautiful you've no words left?", you'd be surprised how true those words are, Midna.), Zelda (tons more beautiful than the other Zeldas) and Ilia (except when she makes a fuss about Epona, the relationship between her and Link is just wonderful).