Mercury Black - Underworld Jet

(Looking more like a Pluto Blue now...) I know, he's hardly recognizable like this, but I recycled a bunch of old ideas and theories I had about Mercury Black, added some new inspirations, and came up with this original form for him, just like I did for Lie Ren in Tempered Lotus. While still mainly using his boots as a conduit, this version of Mercury commands blue flames which he can guide in the air or even through the lava he creates. His flames can also feed on spiritual energy, including dead souls, for fuel. While he can still use his trademark kick-based techniques, he will for the most part be flying and manipulating the fire from his jet trails.

Inspirations:

 - Hades/Ignihyde (Hercules/Twisted Wonderland)
 - Dabi (My Hero Academia)
 - "Find Your Flame" (Sonic Frontiers)
 - Cyborg (Teen Titans)