Inner Demons: Flame Devil

(Please note that since this idea is under development, the term "Inner Demon" may be more descriptive and thus this thing may not actually be a "demon".)

I recently got a table at Ohayocon in Columbus, Ohio to do commission art. During the wait for customers, I drew lots of things, this one included. The idea behind this involves some people being able to summon an ethereal creature that reflects a deeper, darker part of themselves. Initially, these summoned beings appear at least somewhat human, but when the person completely loses himself/herself, it will transform into something truly monstrous...

Some details may need to be worked out.