Charys, formerly known as Ifrit, is a greater spirit; the ruler of flames which was sealed within Shizue Izawa by Demon Lord Leon Cromwell.

He used to live in Dwelling of the Spirit before he was stolen by the "Platinum Devil" Leon Cromwell. After that, he was sealed within Shizue Izawa. As a result of this, it gave Shizue an extended lifespan.



Abilities:
Charys as Ifrit was a greater spirit with a rank that of Special A.

A maelstrom of flames surrounds the Flame Giant, protecting it at all times. The heat of these flames are so intense that an attack like Rimuru's water blade evaporates before it even makes contact.

After being named and evolved, his magicules exploded and is said to be greater than unawakened demon lords such as Frey or Carrion.

Skills:
Fire Manipulation
Combustion
Ranged Barrier
Body Double
Flare Circle

Trivia
The name "Ifrit" comes from the supernatural creature of the same name in Middle Eastern stories and commonly associated with fire.

(Source: Tensei shitara Slime Datta Ken Wiki)