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Allen Zetmia / Devil Eater ApolloA rank-and-file attendant that works for the infamous Sun Arms weapon manufacturing company. He's responsible for inspecting and testing the weapons for quality control, and is a complete jackass with a good heart.
- Absurdly Sharp Sword: Gains a laser blade by the name of Armasol IV.
- Bash Brothers: Becomes a literal sort with his brother Lirus in the Black Blood Crusades.
- Deadpan Snarker
- Expy: Arguably of Scott Pilgrim.
- The Hero: Of Tale of a Sun and Moon proper.
Armasol IV / Devil Eater HeliosThe prototype laser blade that Allen inadvertantly steals from his company - once activated, it is revealed that it has a will of its own.
Nina Leitzal / Moon Shepherd Eos
- Detachment Combat / Pulling Themselves Together
- Elegant Gothic Lolita
- Expy: Arguably of Ramona Flowers from Scott Pilgrim, due to their similar roles.
- Foil: Selene in Tale of a Sun and Moon, and later Reversa ( her sister) in the Black Blood Crusades.
- Genki Girl: Is very warm-hearted and outgoing.
- Mega Twintails: Has two long pigtails tied on the sides of her head.
- Tomboy and Girly Girl: Is the girly to Beatrice's tomboy.
- Zettai Ryouiki
- Black Mage: Is the offense-based magic user of the team.
- Deadpan Snarker
- Expy: Of Kim Pine.
- Green Thumb
- Hot Witch
- Jerk with a Heart of Gold: Comes off as rough and coarse, but is one of the kindest people on the team.
- Kung-Fu Wizard: Is strong with her magic, but prefers to use her fists above all else.
- Necromancer: Her job as a witch.
- Tomboy and Girly Girl: Is the tomboy to Nina's girly.
- Combat Stilettos
- Expy: Of both Squigly and Rick from Splatterhouse. Also shares a striking similarity with Envy Adams from Scott Pilgrim, down to the red hair and them both being singers that used to be girlfriends of the main heroes.
- Losing Your Head: Was originally decapitated by a man named Samael after she turned down his offer to become his personal singer. The only way she survived was thanks to Ronove, which allows her to use this ability non-lethally.
- Mega Twintails: Shorter and puffier than Nina's, however.
- Sibling Team: With her brother Luciano in the Black Blood Crusades.
- Statuesque Stunner: Is six feet tall and she wears high heels on top of that.
- Tiny Guy, Huge Girl: Compared to Allen, she practically towers over him.
- Adaptive Ability: Grants Junelise powers depending on the situation, the most effective being flight.
- The Comically Serious:
- Dark Is Not Evil: Is a powerful bat demon with fearsome dark powers, but is kind and
- Expy: Of Leviathan from Skullgirls and The Mask from Splatterhouse.
- Really 700 Years Old: Is a demon from the now defunct ancient order of the Ars Goetia.
- Sharing a Body: Lives inside Junelise's to help protect her from danger.
- Undying Loyalty: To Junelise ever since he brought her back to life - he becomes devoted to her and cares for her well-being.
- Ambiguously Bi: Falls in love with the False Angel Bellamine... But also shows interest in men, as shown with her comments towards Allen.
- Badass: Is Archangel-rank and about to promote to Seraph for her countless years of service. And it shows.
- Big Good: Is the one that helps Allen and friends combat the seedy underworld of Divixus.
- Lady of War: Has been through various types of battles in the past and keeps a graceful pose even when kicking ass.
- Meaningful Name: Sidera is Latin for star, and guides the heroes on their journey. Also serves as a title drop considering the name of the series.
- Pimped-Out Dress: It's a cross between a uniform and an angelic gown.
- Rapunzel Hair / Tomboyish Ponytail: Has a long light-blue ponytail that reaches down to her back.
Victoria RezamortsThe matriarch of the Rezamorts nobles, and Beatrice's aunt.
- Acrofatic: Thanks to her powers, she can move her body at incredible speeds to make up for her larger figure.
- Big Beautiful Woman: Is certainly very husky, weighing in at 230+ pounds - yet is still considered attractive.
- Black Mage: Even more powerful than Beatrice in regard, due to her wider variety of skills and experience.