*Pyra and Mythra are the human personifications of the legendary Blade Aegis, which is used by their Driver Rex. The girls form a special bond with Rex and share a life force with him, meaning if one were to die, the other will follow suit.

The pair consider themselves sisters, having the ability to mentally communicate with each other through a psychic link. They are also capable of switching into each other freely whenever the need arises.

Though the two are technically the same person as they are the same blade, their personalities are polar opposites. Pyra is depicted as a very timid, soft-spoken, and deeply kind woman.

Mythra, on the other hand, is very reckless and rude with a short temper. However, both share their own set of insecurities, which drive them to continue on with their journey to Elysium alongside Rex and company.*