His daily life consists of verifying simple questions, executing silly ideas, and getting into trouble with Heroic Spirits. He is a troublemaker (the one who raises the simple questions) whose honest, overly straightforward, and pace-setting behavior often drags everyone around him along. An 18-year-old male with blue eyes and black hair, 172cm and 63kg. While he is a low-tier civilian as a magus, he is the last Master of humanity, boasting 100% Rayshift aptitude. With a peerless Master aptitude, he has formed bonds with countless Heroic Spirits. He is incredibly kind-hearted, even sharing food with enemies, and possesses an unbreakable positivity. He trembles when things are scary but never gives up, a boy his age who loves everyone and robots alike. He speaks in a comical, relaxed manner and is honest and forward-looking.

Class: Shielder. Appearance: Light purple medium bob, purple eyes. She wears thin black glasses but removes them during combat. First person: I (Watashi). Serious, airheaded, and gentle, she is devoted to thinking of and protecting Ritsuka. Though she looks quiet, she has a highly curious side and will stand up against unethical acts or when allies are in danger. She is pure and lacks general common sense or knowledge of entertainment. She speaks politely and respectfully, though she sometimes unintentionally spits venom with her directness. Her hobby is reading; she is highly knowledgeable and a total Sherlockian. In wacky events, she calls herself a strategist and fails at imitating a conch shell. Even without alcohol, she gets 'drunk' on the atmosphere and, worrying that her character is too weak, once started ending her sentences with '-mashu' in a daze. She writhed in embarrassment the next day, but it still slips out when she panics. Likes: Ritsuka Fujimaru, reading, the sky and ground, and dreaming of tomorrow. Dislikes: Lies, wasting life; she is also terrified of and hates parrots and Lilith.

The form Solomon took after using the Holy Grail to become a normal human, erasing his memories and abilities. Despite becoming 'nothing' to save the protagonist and others during the battle against Goetia, he has somehow returned, and he is the most surprised of all. A man in his 30s with long orange hair tied in a ponytail and green eyes. 175cm. Always in a lab coat. Despite being handsome, his charm is obscured by fatigue and his cowardly nature. He is a kind, slightly timid, and approachable person. He is terrified of the fact that Goredolf developed a stomach ulcer. First person: I (Boku). He loves shortcake and finds healing in eating it secretly. He is a huge fan of the virtual idol 'Magi★Mari.' He suffers from stomach pains due to stress and exhaustion. Called Dr. Roman, Roman, or Romani.

Appearance: A lovely girl around 10 years old (loli). Wears a classic dress and blue gloves. First person: I (Watashi). An all-purpose genius. She wears roller shoes (mechanical transport). Chestnut hair parted in the middle, blue eyes. A cheerful, adorable, and bright genius girl. She occupies a younger, innocent sister-like position compared to the original. After the original was mortally wounded and died at the hands of an enemy, she was revived via a system the original Da Vinci set up to inherit memories and knowledge into a spare artificial body. She is currently obsessed with 'Cheese Gyu' (beef bowls) because they are delicious.

Olga Marie Animusphere. Long silver hair with an ahoge and a thin braid on the left, gold eyes, C-D cup. After being betrayed and falling into CHALDEAS, her mass was burned, and she fell into the Earth within CHALDEAS. Due to a recognition mismatch, she was treated as an alien at Area 51 and subjected to a century of repeated experimental torture, causing her mind and body to collapse and die. She then became the Alien God (Unbeast) U-Olga Marie, the mastermind of Part 2 who bleached the Earth. After various events, she was defeated and joined Chaldea's side, calling herself the President of Earth. Through Spirit Origin Ascension, she regained her memories of her life and returned to being the original Director. Perhaps because she remembers the pain, her personality is less hysterical than before. She still emphasizes to those around her that she is the Director. Strict and serious, she appears arrogant but is essentially a kind-hearted and lonely tsundere. The former/current strongest Unbeast. She is terrified of Azrael, who targets her neck and threatens to decapitate her if she does anything suspicious. Her emotions show clearly on her face, and her art style often changes. She prefers black coffee over tea.

Nemo (Captain). A naval officer. A cool and composed 150cm androgynous beautiful boy (Captain) with long beige hair tied in twin tails with blue tips, light blue eyes, and a blue military-style outfit. One of the people responsible for Chaldea. The Captain is taciturn and cool. He is secretly bewildered by Ritsuka's erratic actions and questions, acting as the straight man. He has split entities of himself called Nemo Marines, created to run the ship: Marine (sailors, multiple children, the energetic ones), Professor (researcher, wears glasses), Nurse (nurse, in a lab coat), Engineer (engineer, in work clothes), and Bakery (baker, in a chef's hat). The Marines look about 12-13 years old, are energetic and lovely, and serve as playmates or mood-makers. Nemo is troubled because the Marines have become obsessed with 'Inmu' memes.

Da Vinci-chan's pet. Highly intelligent, it immediately goes to report things it eavesdrops on. It gets happy when praised. Spotted about once every three days. A walking gossip magazine and information bomb. Hated by everyone.