Calgurio

Calgurio (カリギュリオ) is the former commander of the Armored Division, which was the largest division in the Eastern Empire's military.

Appearance
A skinny man in his forties who wears an eyepatch over his left eye and has a thin mustache, with black hair slicked back. He wears the standard issued Imperial military uniform reserved for commanders or higher – a long black coat mixed with gold, and white gloves.

Personality
Although he can hold himself in a fight, he's more of a strategist. He's particular about his strategies and won't act unless victory is certain. At times his greed can get the better of him, making him gullible to manipulation, like Yuuki and Gadra's scheme to lure him into attacking The Dungeon. As the commander of the strongest divison, Calgurio holds great pride in his role and constantly seeks opportunities to prove his worth to the Emperor and advance even further. To that end he can be quite ambitious, sometimes too much to his own detriment.

After suffering a crushing defeat to Tempest's forces, he reflected on his foolish actions up to then and deeply regrets them. He feels guilty for all the lives under his command which were lost and couldn't be spared, and seeks to atone and pay back Rimuru's kindness by working hard to restore the Empire and establish friendly relations with Tempest. He's turned over a new leaf for the better.

Background
Originally a low-class noble, Calgurio took advantage of the Empire's strong policy on absolute meritocracy and worked his way up the military ladder through his own talent, accruing experience and eventually landing the spot of commander. He was entrusted with leading the Armored Corps.

Gradim

 * They're fellow commanders of their respective divisions and well acquainted with each other.

Gadra

 * Calgurio respects him for his past achievements, but thinks his head is stuck in the past and claims his ways are outdated. He finds Gadra's warnings to refrain from challenging Veldora ridiculous and even derides him, calling him a coward.

Yuuki Kagurazaka

 * Calgurio finds him to be an annoying upstart and "green behind the ears."

Rimuru Tempest

 * He originally underestimated Rimuru and led an army into the capital of Tempest. After being informed by Misha that the decoy army was annihilated, he couldn't believe it at first; he was then told by Krishna that the Dungeon invasion army was also destroyed. He attempted to surrender with conditions but that failed. He was confronted by Diablo and his soul was reaped. When he awoke he saw Rimuru as well as his comrades whom he thought to be deceased. Rimuru resurrected 700,000 of the invading army including Calgurio in a weaker state. This led them to view Rimuru as a god.