100GF is an actually great manga. Fully self aware of how absurd it is and plays it up really well to hilarious effect. What I am not sure about is how well it can be adapted to anime. I frankly think the humor won't come across as well, but am definitely going to be checking it out.

Frieren has all the markings of a great show based on the staff and the source material is truly excellent, so that is one to watch.

The last one I am going to keep an eye on is Tearmoon Empire. I haven't read it, but the LN series is very beloved.