They won't join but you wish they would.

In my early days of playing BG, before I had learned the identities of all of the NPCs, I would often end up engaging characters in conversation in the hope that they would end up joining my party. One I always wished I could persuade to come adventuring with me was Silke, the female mage that Garrick introduces you to. I liked the way she looked, I liked her attitude and I liked they fact that she was a "thespian extraordinaire". I also think the game could do with an evil female magic user.

Anyway, Silke would have been my choice for a bonus, joinable NPC. Who would you go for?