I voted Aloth, although truthfully, it's a close call between Aloth, Kana, & Hiravias.
Aloth('s primary personality) seemed rather weak to me, and also, I dislike managing a large number of back-row NPC casters. Kana was likable but bland, i.e. forgettable... although I do love me some chanters. Hiravias, I honestly never gave a chance. His voice was like nails-on-chalkboard to me. He basically ate a colon, and then got sidelined forever. And it was never quite clear to me, exactly why Hiravias wanted to join the party in the first place.
As for whom I liked... Durance was fantastic, with great dialog & a great backstory, although it's understandable that his attitude makes him unpalatable to some. Grieving Mother was rather unique; she had me suspecting her to be a Tyler-Durden-figure, what with how the rest of the team couldn't quite see her. And the dialog with sacrificing Grieving Mother to the Skaen pit/blood ritual is just pure gold (although I reloaded after doing this, because GM was consistently a key member on my team). Eder is everyone's drinking buddy (also, second chance armor = very helpful). And Pallegina is not nearly as arrogant as her portrait looks.
Sagani is the only one whom I've no opinion on. Like Hiravias, I didn't give her much of a chance. But I didn't find her annoying; I just didn't need/want a ranger on my roster.