Araj is so delightfully crazy.

Tara (of course cat-auntie has to be mentioned), Rolan, Elminster, Arabella, Omeluum & Blurg, and Dame Aylin might make the top. I love how Tara and Elminster are written, Rolan has such a good story, Arabella is just a darling, Aylin is endearing in her loud, proud, straight forward manner and Omeluum and Blurg are just such wholesome bestis. I mean they discuss with each other what might be nice quest rewards for you. ^^

But it's hard to find a side character, I am indifferent about. I either really like them or really, really dislike them. I am looking at you Wulbren.