Guy Crimson

Guy Crimson (ギィ・クリムゾン) is one of the most powerful and ancient characters in the anime That Time I Got Reincarnated as a Slime (Tensei Shitara Slime Datta Ken). He is a True Demon Lord, the oldest of the Primordial Demons (known as Primordial Red or Rouge), and holds the top seat in the Octagram council of Demon Lords. He rules over the distant Ice Continent from his frozen palace.

In the anime (primarily appearing from Season 2 onward), Guy is depicted as an extraordinarily handsome, androgynous figure with long, glossy crimson-red hair and striking red eyes (often described with a starry, mesmerizing quality). He can freely switch between male and female forms at will, though he typically appears in a male presentation in his key scenes.

Personality-wise, Guy comes across as calm, relaxed, and immensely prideful, exuding an intimidating yet charismatic presence. He tends to be aloof toward most people and doesn't concern himself with trivial matters, but he shows genuine interest in those who intrigue him (like certain rising powers in the story), sometimes approaching them playfully or provocatively. As one of the world's strongest beings and a sort of neutral overseer, he maintains a detached, almost bored demeanor toward worldly conflicts unless they affect the balance he watches over.

He's voiced by Akira Ishida in Japanese (with a smooth, commanding tone that fits his regal vibe). Overall, Guy is portrayed as an overwhelmingly powerful, enigmatic "final boss"-level entity who's far beyond most characters in the series.