Persona 5: Kamoshida's Crown
Shadow Suguru Kamoshida's crown from the game Persona 5. The holes in either side of the crown are for either running a headband through or a pin to keep it in your hair, as the crown is unlikely to stay put on its own. Since I wore a wig with it, I used twist-ties. Worked just fine. It didn't try to fall off my head even once, and I ran around acting crazy with it on.
This was created from images of the game, not from in-game files. I did my best to get it as accurate as possible to both the cartoony avatar of Kamoshida and his in-game model (there are subtle differences).
This is the same crown that DC Douglas (the voice actor for Kamoshida in the US version of the game) wore at DragonCon 2018.
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/cFVaOCPW8Gw