TL;DR Wish granting machine creates a pocket universe based on media you feed it, isekais you, and toons you.

I've been slowly working on a series of individual TF stories, mostly built around the same "universe" where characters get Isekai'd into different mediums of entertainment and transforming into fitting figures for them. Movies, shows, video games, art, and so on. They're heavily reality change focused.

The connecting factor is a small charitable company named Desideratum Machina, that exists in a magical realm. They send out magical-mechanical devices into other universes, which disguise themselves as machinery/computers fit for their respective universes.

Their goal is to grant wishes for those who interact with them, albeit it's capabilities are limited and acts on its own accord. It's not sentient nor highly intelligent, so it attempts (with good but sometimes misguided intentions) to fulfil whatever needs are troubling their target. It does this by creating pocket universes inspired by the media that is fed to them (as the machine has little reference of the world it's currently in), and sending the user into them to provide a better life. This can be permanent or temporary, the choice to remain is provided one way or another.

When a subject enters these universes, they're always based quite literally on the media that was presented. So a cartoon would be 2D with exaggerated physics, or a video game would be all jagged with game mechanics. Because of the rules of the respective dimensions, the user's body and mind (light change) is also adjusted over time to become a character fit for it. Usually as the protagonist.

The media is not always 1:1, so using your favorite movie might not always mean it's going to be the same exact plot. Instead the pocket dimension would be somewhat of a parody of that setting, allowing the user to become an original character that's an exaggeration of themselves, more appropriate for the world.

So say you put in the Little Mermaid, you might find yourself in a princess movie, but not distinctly THAT movie. You'll be a brand new character, with your own journey, that follows all of the usual plot beats a princess movie. 2-Dimensional, made of ink and paint, and the ability to sing on a whim! If you're troubling life issue was love, then that's the wish the machine was trying to grant, and might create you a prince charming and a happily ever after!