Have you tried a LitRPG yet? Dungeon Crawler Carl just had book 6 drop. 1-5 are on audio, and the performances are spectacular.

Yes. The industry standards are:

Solo narration: pretty much self-explanatory.

Dual: used primarily in romance. Each narrator voices everything in the chapter that is their POV. Chapters alternate.

Duet: Alternating POV. The narrator voices all narrative, AND their dialogue in all chapters. When POV switches, so does the narrator, who then does all dialogue for their gender.

Multicast: I use this a LOT when narrating RH (reverse harem). So the FMC does narrative and their dialogue, and all other roles are cast for dialogue only. I had one with 14 narrators. Totally like herding cats, but fun.

Immersive: this is your Graphic Audio/ Soundbooth Theater style. Sfx, music, etc. I will be playing Elle McGib in the upcoming Dungeon Crawler Carl fullcast audio.