Stark because the poor guy (as well as Lillynette) as they could have been allies to the Soul Reapers under better circumstances. Then again, that is the tragedy inherent to his character. Still, I'd like to think Shunsui's Zanpakuto purified him and that he and Lillynette are both chilling in the Soul Society.
Unohana, Bambietta and Nemu because damn, did that trinity of miserable events make me uninterested in even reading the final arc to its conclusion. Also Ukitake, since the poor guy did not go out pleasantly at all. Not to mention it being apparently officially confirmed right at the very end that he was gone.