[That Time I Got Reincarnated as a Slime] Introducing the 7 primordial demons!

2025.07.29

The ever-popular That Time I Got Reincarnated as a Slime is a slime success story in which the protagonist is reincarnated as a slime and steadily rises in rank, or rather, expands his influence. One of the most appealing aspects of the series is how the protagonist, the slime Rimuru, steadily grows stronger. Rimuru's subordinates include goblins, dwarves, and even demons. This time, we'll be focusing on demons and introducing seven demons said to be the original demons.

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[That Time I Got Reincarnated as a Slime] The Original Demons and Their Colors

Diavolo is Cool
Source: That Time I Got Reincarnated as a Slime © Taiki Kawakami, Fuse, Kodansha / TenSura Production Committee
The seven original demons are color-coded. This setting wasn't present in the web version, but it appears in the published version. Red, green, blue, black, yellow, white, and purple. Each color has a corresponding demon. As the original demons, these seven are incredibly powerful. Although they aren't all in the same faction, Rimuru's forces, with multiple Primordial Demons under their control, are truly terrifying.

[That Time I Got Reincarnated as a Slime] Primordial Demon, Red, the Oldest Demon Lord, Guy Crimson

Source: That Time I Got Reincarnated as a Slime ©Taiki Kawakami, Fuse, Kodansha / TenSura Production Committee
In fact, Demon Lord Guy was one of the Primordial Demons. Although Guy is said to have the power to destroy the world, he cooperates with the wishes of his friend and original dragon, Veltanava, and reigns as the Demon Lord as a deterrent against humans. He is also in the middle of a game with the hero Rudra, and does not appear to have any intention of destroying the world. Although he is a hermaphrodite, one of the dragons, Velzard, seems to like Guy. He has a good relationship with Rimuru, and is one of the strongest characters in the game, said to be on a par with the talented Milim. Incidentally, cake has become his favorite food.

【That Time I Got Reincarnated as a Slime】The Original Demon, Green Misery

Source: That Time I Got Reincarnated as a Slime ©Taiki Kawakami, Fuse, Kodansha / TenSura Production Committee
Misery is a subordinate of Demon Lord Guy. Misery, dressed as a maid, is taught the cake recipe by Rimuru after Demon Lord Guy takes a liking to the cake Rimuru makes for her. At the time, she was a Demon Lord. He evolved into a Devil Lord using Rimuru's secret evolution technique. His strength is on an awakened Demon Lord level. In Kazaream's battle for revenge against Leon, he aids Leon and goes easy on Kazaream, buying time until Benimaru and the others arrive.

[That Time I Got Reincarnated as a Slime] The Original Demon, Blue Rain

Source: That Time I Got Reincarnated as a Slime © Taiki Kawakami, Fuse, Kodansha / TenSura Production Committee
Like Misery, Rain is a subordinate of Demon Lord Guy. Like Misery, she evolved from a Demon Lord to a Devil Lord thanks to Rimuru's secret evolution technique. She seems jealous and dissatisfied with the way Diablo treats Guy, despite his loyalty. Rain is a demon that appears less frequently than the other six.

[That Time I Got Reincarnated as a Slime] Primordial Demon Black Diablo

Source: That Time I Got Reincarnated as a Slime ©Taiki Kawakami, Fuse, Kodansha / TenSura Production Committee
This demon was summoned from the remains of a soldier left behind when Rimuru evolved into a Demon Lord. He possesses overwhelming combat power and is loyal to Rimuru. He describes Rimuru as beautiful after he has become a Demon Lord, and wishes to assist him in any way he can. When Rimuru is short on magical energy when reviving Shion, he offers up one of his subordinates as a sacrifice to Rimuru and helps him revive Shion. Although he is defeated by Benimaru in the final of the tournament, Rimuru says that his strength will soon surpass that of Benimaru. After becoming a Demon God, Diablo, Zegion, and Benimaru become his subordinates with high fighting power, second only to Veldora. In the final battle, he displays his truly demonic power and assists Rimuru.

[That Time I Got Reincarnated as a Slime] Primordial Demon Yellow Carrera

Source: That Time I Got Reincarnated as a Slime © Taiki Kawakami, Fuse, Kodansha / TenSura Production Committee
One of the demons who was beaten up by Diavolo and forcibly brought under Rimuru's command. His name is apparently derived from the Supercar series. He serves alongside Gerudo as an intelligence officer in the battle against the Imperial Army. He has under his command the high-ranking demon Agera, who is a hard worker, and the witty, unstoppable Carrera, who he always has trouble keeping in check. He's a completely chaotic demon, having attempted to use nuclear attack magic against the Imperial Army.

【That Time I Got Reincarnated as a Slime】The Original Demon: White Testarossa

Source: That Time I Got Reincarnated as a Slime ©Taiki Kawakami, Fuse, Kodansha / TenSura Production Committee
Like Carrera, Testarossa was brought here by Diavolo. Testarossa was a rational demon, marking the boundary of the advancing Imperial Army and urging them to retreat, but when the Imperial Army crossed the boundary, she calmly devoured the souls of the soldiers, making her the very definition of a demon. Gobuta, who didn't know Testarossa, spoke rudely to her.

[That Time I Got Reincarnated as a Slime] Primordial Demon Purple Ultima

Source: That Time I Got Reincarnated as a Slime © Taiki Kawakami, Fuse, Kodansha / TenSura Production Committee
A demon brought to Diavolo along with Carrera and Testarossa. During their first battle, she seemed to like Gabil's politeness. While all three are female, Ultima speaks like a child and refers to herself as "boku." However, Ultima is also a fearsome being with overwhelming strength. He is said to be the most brutal of the three. Carrera, Testarossa, and Ultima became Demon Lords using the human souls possessed by Demon Lord Guy.

[That Time I Got Reincarnated as a Slime] Summary of the Original Demons

Rimuru's forces include four original demons, including Diavolo, brought by Diavolo. There are also many lesser demons. These demons possess overwhelming cruelty and power. It is unclear whether Diavolo will appear in the anime, but I would love to see him.

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