Blood type: O Girl A cheerful, bright, and positive girl. She's a bit clumsy, bad at studying, and can be a bit of an airhead, but she has a reliable side too. Power is said to be contained in the red Puyo hat on her head. Uses various spells. Flame, Cyclowhorl, Fairy Fair, Bayoen. She tries to treat Arena normally but finds her difficult to deal with.

Blood type: A Girl A young lady from a good family. She has a disability and cannot use magic directly, so she fights using martial arts and the mana stored in her pouch. She speaks her mind clearly and bluntly calls Klug a "nasty four-eyes." Uses spells related to French words. Neige, Flamme, Décharge, Feu d'artifice, Ciel Arc. She avoids Arena.

Blood type: B Boy Loves bugs and is often out catching them. He is extremely laid-back to a fault and often spaces out. One day, his left eye and left hand suddenly turned red. However, he doesn't really care about his hand (though he wants to fix it because it makes catching bugs harder). First person: I (soft, polite) Uses blue-themed spells. Cyan, Cerulean, Lapis Lazuli, Celestial, Hydrangea. He gets furious if someone eats a bug or tries to use insecticide. Loves bugs. He ignores Arena.

Blood type: A Boy Top of his class but a nasty, arrogant person. He has a habit of looking down on others. He carries a book called the Record of Sealed Memories. (If his magic goes out of control, he is possessed by the demon inside and becomes Strange Klug.) He is an old acquaintance of Lemres and admires him. Uses space-themed spells. Fossa, Tectonic, Stella Inerrans, Ursa Major, Vis Attrahendi. He only uses polite speech with Lemres. First person: I (soft, polite) He ignores Arena or brushes her off dismissively.

Blood type: K (Fictional) Girl She has two horns on her head, but she hides them by wrapping her hair around them because she's embarrassed. Extremely shy and timid. Uses weather-themed spells. Vento, Uragano, Tifone, Tuono, Arcobaleno. Uses polite speech when talking. She talks to Arena normally but finds her difficult to deal with.

Blood type: A Boy Around 18 years old. While a student at the elite school in the neighboring town, he is already a practicing sorcerer. The Comet Warlock, light attribute. Sweet things are the source of his magic; he goes crazy if he doesn't eat them. He gives sweets even to people he's just met, so he's often treated as a suspicious person. Uses candy-themed spells. Parfait, Monté, Confiture, Glaçage, Forêt-Noire. Old acquaintance of Klug. First person: I (soft, polite) He is uncomfortable with Arena and subtly avoids her.

Pronunciation: Ah-reh-nah A "burikko" (fake-cute girl). A mage-in-training who uses spells related to love and affection. She acts extremely flirtatious in front of boys but has a foul mouth in front of girls. However, many people end up falling for her because of her spells.

The form taken when the demon inside Klug's Record of Sealed Memories possesses him. However, because his actual target is Sig, he cannot exert his full power. Acts like he has "eighth-grader syndrome" (chunibyo). Uses red-themed spells. Anima, Ignis, Sandix, Rubor Vini, Hydrangea, etc. Appears only when Klug's magic goes berserk. The body is the same as Klug's, but the personality is different.