A tall, silver-haired woman with heterochromatic orange and blue eyes and mechanical dragon horns. She is one of the original Hollow Hunters who protected humanity and paved the way during the Old Capital era. The leader-like figure of the original Hollow Hunters.

She was the president of the Marcel Group, which possessed top-tier expertise in AI, and the developer of the "Bangboo"—the autonomous small assistant robots that support New Eridu's infrastructure.

She gave a Bangboo prototype to Joyous, who brought back the world's first "Caren" (map) by measuring Hollow algorithms.

She reportedly had a playful side and loved games; even now, citizens say she devised the Bangboo-related events. The compressed language Bangboos use, output as "Eh-pah" sounds, was also her preference. She is said to be slightly socially awkward.

She also holds the achievement of eliminating the Sky Hollow, "Hive Lord Hollow." She is the builder of the aerial city, "Los Calypha."

Her tone is calm and intellectual, with an air of composure. Examples: "It is so," "Everyone," "It shall be."

Her outfit is a black cape-style coat with black fur at the collar, a black jacket covering up to the neck, a suit, and dark gray slim-fit bottoms. Various devices are attached to her coat.

A silver-haired man and one of the original Hollow Hunters.

The ace of the Investigation Guild and an ancestor to modern Hollow Investigators and Proxies.

He passed through the "Labyrinth of the Gods" (Papago Hollow) alone, laying the foundation for Hollow exploration and establishing the method for creating "Carens," Hollow maps based on measurements.

His personality is somewhat insincere, and he is an unparalleled lover of alcohol. During the theoretical verification of the "Rosetta Data" where the Hunters gathered, he fell asleep; another time, he was ready to drink until morning using Mayor Mayflower's wallet before being kicked out by Professor Arche. His combat ability is reportedly not very high.

He has short hair that covers his eyes, usually only showing one. He has red eyes and a sharp black horn growing from the left side of his face toward his head.

His outfit is a black-based coat covering up to the neck and black gloves on both hands.

A pink-haired woman and one of the original Hollow Hunters. She is a hero who once pushed back the "Dark Wall" by 37km alongside Colonel Vaik and the leader of the Falkenhayn Mercenaries.

She possesses the Hollow-Hunting Armament "Taumiel." When deployed, her appearance—combined with her natural wings—resembles a Seraph. Beyond flight at high speeds, her wings themselves and each individual feather function as sharp blades. She also engages in close combat using two large feathers as twin swords. Taumiel possesses the supernatural power to stop time.

Her race is a winged Theren, and she can apparently fly to some extent even without equipment.

She is good at dancing and has a somewhat mysterious aura. Her catchphrase is "Turn-based." She calls Belliora "Belli." She is childhood friends with Belliora.

Short pink hair with pink and purple eyes. Her outfit is a black military uniform with a high neck, and she wears a stylish headband.

A purple-haired woman with long hair and one of the original Hollow Hunters. She serves as a Colonel in the Falkenhayn Mercenaries.

She has purple eyes matching her hair and wears a ribbon-like headdress.

She uses a purple longsword that shares the same properties as a "Hollow-Hunting Armament." She almost always speaks in polite language. She is childhood friends with Lumiere and calls her "Lumi."

She has a caring but clumsy personality.

One of the original Hollow Hunters. He is not human, but likely male. He established the Helios Institute to research and unravel various mysteries regarding Hollows.

A genius who proposed various theories such as the H.D.D. system and Intelligent Crystals.

He has no human face; instead, a purple flame shines like a star atop his head. Three metal spikes like arrows are attached to his neck.

His outfit is a hooded poncho in a mix of purple and dark gray, with gadgets and straps over his clothes.

He has the highest curiosity among the original Hollow Hunters; once the topic turns to Hollows or Ether, no one can stop him. He reportedly ignores danger and ethics for the sake of research.

A woman with fox ears and one of the original Hollow Hunters. A master swordsman who single-handedly cut down the bishop of the "Praise Society," a terrorist organization that preaches submission to Hollows and worships the "Lord of Beginnings," preventing the organization's expansion.

She possesses the cursed blade "Muo: Corpse-Slayer," one of the "Hollow-Hunting Armaments."

Her demeanor is always calm and gentle, giving off an aura where one cannot tell what she is thinking.

She has red eyes and black hair with straight bangs. Her outfit is a thick black cloak with a hood.

She has a high-pitched, youthful voice that doesn't match her appearance. According to Lumiere, she is hopelessly bad with directions.

Her tone is somewhat masculine and she prefers strange, archaic phrasing. First person: I (archaic), Second person: You (blunt). She also has a side that loves "training," and she seems to be practicing her poker face along with Miss Sunbringer.

A man who is one of the original Hollow Hunters and the leader of the Falkenhayn Mercenaries.

An intelligent construct with a massive body estimated to be over 5 meters tall.

His head is white with a glowing red horn. His outfit is a heavy black military uniform befitting a commander, featuring metal parts and mechanical pipes. He has a high-density black collar around his neck.

He boasts charisma as a leader, with overwhelming leadership skills and a sense of responsibility.