You can save whenever.

The world is dark - especially in the first game. There is slavery, racism, demons, and a few even darker topics. There are optional sex scenes, but they’re rather clean. One of the demon models is rather skimpy. But in the third game you can pick your time in the game while kids are watching to be mostly fun with bright colours and some fantasy fighting. That might be harder in the first.

There are similarities with Mass Effect, but they do play very differently. The dialog system is very similar in 2 and 3, as are the companion interactions in all three.