Feature: Find out what personas can be created from a persona

[matrinox]

This is the opposite of what's currently available. Returns a list of personas to pair (2-way or 3-way) and the results.

This might be a bit niche but I'm happy to submit a PR for this.

[arantius]

Have you seen https://chinhodado.github.io/persona5_calculator/index.html#/list ? Pick any persona, "Fusion from this persona" section.

[matrinox]

Thanks. His site doesn't seem to have 3-way fusions. I'm already in the process of coming up with a "combinations" page that does just that. I'm just a bit confused on how 3-way fusions work. I looked at the list and the source is a 2-item array. Shouldn't it be 3?