Guy Crimson

Species: Devil Lord

Title(s): Lord of Darkness; True Demon Lord; Red Primordial; Ancient Demon Lord

Gender: Possesses the ability to switch between a male or female body at will.

Age: 20,000+

Hair Color: Red

Eye Color: Red

Kind: Inhabitant

Status: Alive

Country of Residence: Ice Continent

Occupations: Demon Lord

Disaster Rank: Catastrophe

Affiliations: Octagram

[Spoiler] Guy was summoned to the world by a human as an Arch Demon and was tasked with destroying a nation the human was at war with. He followed that up by destroying the human's nation as well. This earned him his name. An unpleasant-sounding name, like the shrieks of the doomed and desperate as he crushed them. After being named he realized that he had awoken as a True Demon Lord. [/Spoiler]

(Source: Tensei Shitara Slime datta ken Wiki)