Photron

Photron (Photoron in Japan) is an ancient species that is one of the universe's most important races. They played an important role in the history of the galaxy by having forged the holy sword Galaxia years ago while the universe was still young. Galaxia took Photron many years to make, after which NME hired the great beast Kirisakin to steal the sacred blade and hide it in a dark cave, where Meta Knight and Garlude went to reclaim the sword.

Physical Appearance
Photron isn't very hard to describe - they are simply tall people made entirely of fire, and made a small appearance in Kabu's flashback to the time that Galaxia was made.

Trivia
An interesting fact is that Photron is called the race of light. This fun fact is very interesting indeed, as Nightmare goes around calling himself the Emperor of Darkness. So naturally, both Photron and Nightmare can be seen as foils to one another.