WN/Rimuru's Twelve Guardian Lords

"Altight then, Benimaru. Do you know as of today you might even become a demon lord?"

- Rimuru

Rimuru's Twelve Guardian Lords [十二守護王,  Juuni Shugo Ou] are the top 12 executives of Rimuru Tempest. They are those subordinates who have been awakened as True Demon Lords and have been bestowed a title of a "Lord."

Among them, 7 were awakened after successfully defending against the Eastern Empire and the remaining 5 were awakened before the Tenma War after Guy had given Rimuru 500,000 souls to evolve Mizari and Hirari.

These executives are:
 * "Flare Lord" Benimaru
 * "Star Lord" Ranga
 * "Dragon Lord" Gabiru
 * "Barrier Lord" Geld
 * "War Lord" Shion
 * "Demon Lord" Diablo
 * "Chimeric Lord" Kumara
 * "Mist Lord" Zegion
 * "Gehenna Lord" Adalman
 * "Killer Lord" Testarossa
 * "Pain Lord" Ultima
 * "Menace Lord" Carrera

Chronology
Rimuru initially had 945,000 souls after defeating the Eastern Empire. He used 10,000 souls to partially revive 700,000 Empire soldiers, 700,000 souls to awaken 7 of his subordinates, 5,000 souls to name Wenti, and 20,000 souls to let Ramiris name the Four Dragon Kings (Zephyrus, Boreas, Notos, Euros), thus leaving him with 210,000 souls.

Right, when the ceremony was done, Guy Crimson, who was surprised at the sudden awakening of several Demon Lords, came flying and demanded an explanation and after having conversed with Rimuru, requested that he awaken his two subordinates, Mizari and Hirari, as well. Accepting, Rimuru requested Guy for 500,000 souls with Raphael's bold and daring swindler's advice.

Although the ability of Gluttonous King Beelzebuth required around 100,000 souls to evolve a capable being into True Demon Lords who did not have the Demon Lord's Seed (so he actually only needed to request for 200,000), Raphael took the chance and asked for more since Guy did not know of the actual soul requirements. This took into account all of Rimuru's remaining subordinates who were capable of evolution.

Once Mizari and Hirari arrived, instead of directly using 100,000 on each, Rimuru steadily infused them with souls until they started evolution. This caused him to use only 180,000 souls total (he only needed to provide 90,000 each because Guy once upon a time tried to evolve those two using 10,000 souls as well, but failed), and leaving him with 530,000 souls in stock.

Later, before the Tenma War began, Rimuru spent 500,000 souls and evolved his remaining "Lords."

Benimaru
After the war against the Eastern Empire, Benimaru was naturally selected to be the first person to receive post-war rewards. Although he was surprised that his reward was being awakened as a True Demon Lord, he gave up and prepared himself for his new powers.

Rimuru gave him the title of "Flame Lord" and transferred 100,000 souls into his being through the soul corridor to commence the evolution. However, nothing happened.

It seemed there was another requirement. Since the concept of lifespan becomes meaningless when one awakens as a True Demon Lord, there is no need for reproduction anymore. As the leader of the Ogre tribe, which was on the brink of extinction, unless Benimaru bore kin, his evolution would not begin.

"You better be resoluted, Benimaru. Momiji, come forth! I hereby recognize the binding of souls between you and Benimaru!"

- Rimuru

And thus Benimaru and Momiji were engaged. Later, after the ceremony, their official wedding took place.

Before the Tenma War, when 'everything was done', he automatically awakened as a True Demon Lord and evolved from a Fair Oni into a Flame Spirit Oni (Upper tier Diving Monster Spirit). Thus, carrying on his post as one of Rimuru's three strongest subordinates.

Ranga
Ranga was in the second group of monsters that Rimuru named. He only named Ranga, but the effect evolved the entire pack. Ranga was the son of the Dire Wolf chief that Rimuru had to kill. When Rimuru showed his superior aura, the rest of the Dire Wolf Clan bowed in subjugation. Although Rimuru paired each wolf with a hobgoblin, Ranga decided to remain in Rimuru's shadow soaking up his aura causing mutations.

Ranga was present for the meeting with the Ogres and fought them to protect the hobgoblins. He was present again at the battle against the Orcs and distinguished himself against them. In each battle, Ranga was front and center fighting with Rimuru and the other monsters. Due to his constant absorption of Rimuru's aura while in his shadow, Ranga constantly and consistently grew more and more powerful.

After the Eastern Empire, Ranga was naturally selected for a reward and was given 100,000 souls and named Star Lord Ranga, his evolution was not immediate and he returned to Rimuru's shadow. He evolved into a Wind Spirit Wolf (Upper tier Divine Monster Spirit). Ranga has since acquiesced to bond with Gobuta as a Wolf Rider in battle.

Gabiru
Gabiru was in the fifth group of monsters that Rimuru named. He was originally named by Gelmud. After Gelmud's death, his 'named' status became fundamentally non-existent, thus allowing Rimuru to somehow name Gabiru as 'Gabiru' again, evolving him into a Dragonewt. Gabiru became Rimuru's subordinate after he was exiled from his tribe by his father. He originally worked to grow herbs that is the ingredient for healing potions.

After evolving into a Dragonewt, he became at least an A-ranked monster. He also formed his own squad that was named Hiryuu, the aerial force of Tempest. At one point, his squad was considered the strongest force in Tempest.

He is quite proficient with the spear. He was strong enough to keep up with Pico, which was an extremely strong foe whose weapon of choice is also a spear. He wields the Vortex Spear in battle.

After Rimuru defeated the Eastern Empire, Gabiru was given 100,000 souls and was given the title Dragon Lord Gabiru, his evolution was similar to his ability Dragon Transformation. Gabiru has since become a force to be reckoned in battle and is not to be underestimated.

He has the Ultimate Gift, "Pierott Star." Which allows him to change his fate once a day.

"Is it so unexpected!? Does the fact that I’m not dead irk you so much? There is a reason I can’t die, so please forgive me, Miss!"

- Gabiru

Shion
Rimuru's bodyguard and first secretary. Unlike Benimaru, Shion didn't have to produce an heir as a stipulation for becoming a Demon Lord

Diablo
After the war against the Eastern Empire, Diablo was given 100,000 souls and the title 'Demon Lord'. Evolving into an Awakened Demon Lord, he became the most powerful of Rimuru's top 3 subordinates. He had all his increased energy perfectly under control with which, his evolution put him at the highest peaks along with the world’s strongest. His Gift propagated through his subordinate Venom who evolved into a Demon Peer, while the 100 demon troops in turn subordinate to Venom became elite Demon Knights.

Kumara
The nine-tailed fox who would later be named Kumara was the subordinate of Demon Lord Clayman. Serving in the group known as the Five Fingers, she was the "Thumb Finger." After being forced to fight during the Demons Lords Banquet, she was paired off against Ranga. Summoning the White Ape and Moon Rabbit to fight alongside her. Rimuru freed her from Clayman's curse and afterward, she goes on to join Rimuru in Tempest. Being given the name Kumara she would also have Rimuru name her eight friends who were extensions of herself further increasing her power significantly.

After the Eastern Empire's force of almost a million strong was beaten by Tempest. Kumara would be given 100,000 souls and the title "Chimeric Lord Kumara." Evolving into an Awakened Demon Lord she would be ordered to return to the labyrinth so as to not run berserk as she desperately tried to keep her senses. She would complete her evolution by the time Rimuru went to face Rudra and Velgrynd. Afterward, she would obtain the Ultimate Skill: Mythical Beast King Bahamut and she would be assigned as the protector of the children during the Tenma Great War as they assisted Masayuki.

Zegion
The insectoid monster who would later be named Zegion was found by Rimuru one day on the verge of death after killing a blade tiger. Once it was discovered Zegion was protecting a wasp who would also be named Apito. Rimuru saved them by giving them some of his cells and names after making a deal to provide him with honey on a regular basis. Zegion would go on to protect the Treants and upon first meeting him, Ramiris began saying bizarre things that Rimuru ignored. He would later be moved to the labyrinth with the Treants and there he would prove his strength against the Empires invasions force.

After the Eastern Empire's force of almost a million strong was beaten by Tempest. Zegion was given 100,000 souls and the title "Mist Lord Zegion." Evolving into an Awakened Demon Lord, he is now one of Rimuru's top three subordinates. Suppressing his power from running amok, he would become a chrysali inside of the labyrinth in order to complete his evolution and he would forcefully complete his evolution by the time Rimuru went to face Rudra and Velgrynd. The only one to receive a gift from his evolution was Apito and he would obtain the Ultimate Skill: Illusion King Mephisto.

Adalman
The guardian of the 60th floor of the labyrinth. He was a high-ranking Undead King that looked like a polished skeleton. Once he was a high-ranking Priest who had gone to purify the dead spirits that had gushed forth from the remains of a battlefield in the Jura Great Forest, but he had become the shadow of his former self after becoming an undead, because of an undead’s abnormal status, that is, undeadification. But, as a result, Priest Adalman had become an Undead with enormous magic power, though it was a case of the tail wagging the dog. It had become the King of Ghosts with that magic power and seemed to spend its time quietly in a cave.

After the Eastern Empire's force of almost a million strong was beaten by Tempest, Adalman was given 100,000 souls and the title "Gehenna Lord”. He initially refused to ascend to Demon Lordship due to his defeat against Krishna but after his fight with Dino, he was evolved into a Death Spirit (Middle tier Spirit Monster).

Demon Trio (Testarossa, Carrera,Ultima)
They were scouted by Diablo to serve under Rimuru as part of the newly formed Black Corps. Upon their summoning to Rimuru, they were named, following which they evolved into Demon Peers. Their individual strengths were considered even more powerful than former demon lords.

Following the 7 Lords evolutions, the Trio (Testarossa, Ultima, Carrera) were considered to evolve but due to the Insufficiency of Souls to awaken all 3 together, Rimuru didn't evolve them, as originally being equal in power, to begin with, evolving only 1 or 2 of them could cause a misbalance of Power among them. Prior to their awakenings, they were granted the titles ‘Killer Lord’ Testarossa , ‘Pain Lord’ Ultima, ‘Menace Lord’ Carrera.

After obtaining 500,000 souls from Guy with Raphael's help, Rimuru successfully awakened them, following which their evolutions resulted in them in becoming ' Devil Lords', attaining the highest rank in the Demon Aristocratic classes. The three of them successfully ascended to the Highest Rank of Elites.