Entropy's Servant

Part 1 character summary

Tempest (Witch Queen)
Notable Skills: [Magic Formula Comprehension] [Explosion Resistance]

One of the five Demon Generals, Tempest has verdant green hair, messy and waist-length, and dark purple eyes. Her standard getup is a slightly oversized lab coat, though she doesn't have safety goggles and doesn't tie up her hair. On her feet is a pair of black arcane boots and similarly coloured socks, and the witch's hat with a crown-like design embroidered inside reveals her species to anyone with a functioning pair of eyes. The bags under her eyes and her dishevelled hair betray many sleepless nights of indulgence.
Tempest is, in a single word, a scientist. If one were to add a word, she is a mad scientist. While she is normally somewhat sociable and friendly, if she gets engrossed in something, there is a large chance she won't speak until she finishes or Astaroth takes her somewhere else. Despite this, there are only few things she can get truly invested in--research topics such as magic often catch her eye, and she enjoys inventing new magical technology, but regular knowledge and things such as martial arts hold no value to her.
Although it wasn't shown in this part, the magical machines she builds have a large chance of exploding, rather than performing their intended function.
In the castle, she's viewed as a genius, particularly by the more magically inclined Demons. However, many Demons have also learned to stay a safe distance away from her while she's working on something. They generally don't possess [Explosion Resistance], after all.
In Tempest's eyes, Astaroth is fascinating. His mana capacity is higher than any mage's she's ever seen, and above all, he provides her with as many materials as she requests while only giving her minor scoldings when she blows something up. She slightly regrets that he won't let her research him, but she can live with it.

Other

Evyna (Shadowcaster)

Evyna used to be a reincarnated human, with flowing golden hair and bright golden eyes. She was reincarnated by the Goddess of Light and, as such, she was a Hero. She was a mage-type.
Since then, Astaroth has converted her to the faith of the Goddess of Darkness, and she's undergone a ritual to become a monster. As a result, she's now essentially an animated shadow, though she still wears her robes from her time as a human.
She slightly misses her hair, but she feels like she'll live.
She has a naturally nervous disposition, and this is only worsened by the fact that she's constantly around Astaroth and his Demon Generals. As a result, so far, she hasn't spoken a single sentence without stuttering.
From her perspective, Astaroth and his Demon Generals break the concept of 'common sense' to smithereens.
Due to her Hero skill, she can cast any spell contained in her grimoire regardless of affinity.

Rhud (Cursed Golem)

A unique 'petite-model' steel golem which has had a soul fused into it. Unlike a regular steel golem, its mechanical joints are exposed, and it is only about the height of Astaroth's waist. As it is a steel golem, its face carries no expression, and only the vaguest hints of a personality are present. Those hints point at a hard-working, happy-to-be-relied-on person. It holds the special position of Chief Blacksmith, and is in charge of creating Astaroth's equipment, save for the magical tools made by Tempest.
At least to some extent, it seems to be considerate of others: however, due to its nature, it is also occasionally hard to understand, such as when it lists percentages in an attempt to convey how hard to hold something.

Raoul (Vampire Duke)

A Vampire with an almost feminine charm, Raoul has long, slender fingers and somewhat gentle features. Despite this, his deep red eyes constantly have a strong gleam of villainy and a strong smirk almost never leaves his face. Like practically all of the Vampires, he dresses like a human noble and carries a parasol.
He seems to hold a strong loyalty to Astaroth.