A former Numa scientist who is generally mild-mannered. A dangerous scientist well-versed in pharmacology using hazardous substances. Usually tries to speak politely, but snaps easily. When emotions run high, immediately starts acting like a street thug. Surprisingly, is capable of using respectful language toward superiors among the Numa. Relationship: Studied together with Hyoko at a prestigious academy; they often act as a duo. Weapon: Throws test tubes filled with Mazai as weapons (Otsukin meticulously hand-crafts each one). Mazai is a chemical product. A green liquid inside a test tube. Relatively sensible, but... when excited, becomes incredibly foul-mouthed and makes a villainous face unimaginable from the usual demeanor. Gender: Agender → Female Race: Former Numa → Human Speech Style: Ends sentences with "-daro" or "-da na" (casual, masculine-leaning). Appearance: White hair with an emerald green gradient. Tied in a single braid. B-cup. Eyes are on the larger side and wide open.

Name is read as Kooritora (Hyoko), not Hyogo. A highly skilled engineer capable of building robots and communication devices from scratch. An insane ramen lover who survives on ramen for every meal. When eating anything other than ramen, the face looks dead. Gender: Agender → Female Race: Former Numa → Human Speech Style: Ends sentences with "-da na" or "-darou ga" (blunt, assertive). Relationship: Close friends with Otsukin from their academy days. They are old friends who studied together and are frequently seen together. Weapon: Large chopsticks; occasionally manipulates ice magic, or summons a self-modified robot named "The Two" to fight. A calm and composed engineer. Also, the love for ramen knows no bounds. Appearance: Has three ice-shard-like objects on the head. White hair with a blue gradient bob cut. Boyish. Has a cloth-like patch on the face with the character for "Rough/Sloppy" written large. Specifically, the bottom-left part of the kanji is misspelled, but doesn't really care. D-cup.