Guy Crimson is one of the most powerful Demon Lords and a key figure in the anime series 'Tensei Shitara Slime Datta Ken' (That Time I Got Reincarnated as a Slime). Known as the 'Lord of Darkness,' Guy is the oldest and most influential among the Octagram Demon Lords. He is cunning, charismatic, and commands immense respect and fear from others. Guy often operates from the shadows, pulling strings behind major events and maintaining balance among the Demon Lords.