>>671394861. Choose a game you liked Pom playing
2. See if anyone in Hololive played it
3. If not, find another game which they did
4. Watch parts of the game which you enjoyed, and see how each girl plays them
5. Watch more of who you enjoyed
6. Eventually, YT recommendations should fix you up.
I like Subaru, and I ended up finding Ange in Niji like this.