Question about using characters in real life event.

[NaesakiAshwell]

As long as you aren't producing stuff with the intention to sell then it should all be perfectly fine as long as it is strictly for personal use.

[Bourne_Endeavor]

If strictly for personal use, you can do whatever you like. Square Enix can only step in if someone were to try and make a profit off their models. So no need to worry. I think it's a pretty adorable idea btw