So far (I’m in the middle of questline in the Scorched Desert) I liked in particular Zhara, Tanis and Said. They are, from beginning, three dimensional characters even despite the secondary role of some of them. I liked the trio of the Innsmouth Academy (Annabel Usher, Hayden Montag and Carter) even if more for the setting and the missions than themselves as characters. Same for Tyler Freeborn.
I found, instead, too much overacting or stereotyped characters like Sam Krieg, Eleanor Franklin and some minor characters in Kingsmouth, but I can’t say I disliked someone in particular.
In general, I found all the stories are interesting, investigation missions are challenging (sometimes too much like the damn “Signal Effect” side-quest that took maybe six hours of time to me and my companion to figure how to decrypt the message and find the destination) and it’s very pleasing putting togheter all the pieces of the general story.