These are obviously spoilers.
- There are plenty of characters you get to know, but those are the main 3
- My daughter wasn't fussed by the first episode, and she liked the rest more
- Yes
The kids and I had never played the games, but we enjoyed it.
It's a bit silly at times, for example (* minor spoiler) with Coop having no issues with T60s in the last episode, but not being able to shoot one in the first/second episode.