Gaming story channels are a perfect starting niche because you probably already have the footage. If you have ever recorded your own gameplay on an Android screen recorder, you have the raw material. Subway Surfers, Minecraft, GTA Mobile, and other popular mobile games all work as background footage because they have high visual density -- enough movement to hold attention while the audio narration carries the story.
The Pairing That Works
Horror stories over Minecraft footage. Revenge stories over Subway Surfers. Finance motivation over GTA Mobile. The combination of a familiar visually engaging game and an emotionally compelling audio story creates the exact viewer experience that faceless channels are built on. The viewer does not need to understand the game -- the gameplay is visual interest, not content. The story is the content.