It's got a ton of characters, though the core of the few main protagonists are the ones with the most weight on the overall story.

It has VERY detailed wolrdbuilding and a complex plot that gets exposed bit by bit and you can only understand all of that if you replay the game and take different decisions leading to seeing different events. Be prepared to read a lot though, especially if you also want to play sidequests that involve the secondary characters.

The battle system is engaging with a lot of factors to consider when planning, including terrain effects, height and cover. It's also really unforgiving and putting yourself in a bad position can lead to someone in your group getting ganged upon and knocked out fast.