An old what-if I did during the Wano arc Kings battle. I was anticipating that Sanji would be revealed to have DNA tampered with Lunarians to explain his unusual ability to use fire-based moves. I also thought it would be a great way to give Black-Leg a powerup, like maybe realistically he would get small black wings on his legs like Hermes, and it would enhance his sky-walk. Ha! No, seems like Sanji will just be a weirdo cyborg it seems.
This comic is just me cranking up the drama factor as you do