Princess Rubiria (ルービリア姫), nicknamed as Tomboy Princess, is the daughter of the First Queen and little sister of the First Princess of the Sternbild Kingdom.


Because of her unusual prowess at mind reading, Rubiria was confined inside of her Amber Palace until she turned 12. This has caused her to discern the dark sides of humans and only trust a few. This along with a spoiled upbringing has caused her to become arrogant in not only herself but her ability despite the fact that she still remains quite naive due to her limited experience in the world (as noted by Rou).


Rubiria has the typical appearance of a twelve year old girl. She has a thin, fragile-looking constitution to the point Rou believed she might break if he touched her. Her hair is platinum, and is considered by Rou to be quite beautiful. It is usually tied into pigtails.


Rubria hated the fact that she could read everyone's mind.


She was first introduced when she was kidnapped by "thugs" in Trient and rescued by McCool Shay with the help of Rou. Normally it would have been the end of the First Expedition for Rou's group, but she then employs him to escort her back to the Royal Capital. She enjoyed her trip so she invited Aporou & co to stay the night in her palace. She even gave a [Proof of Royal Authority] giving him some pass right and a reward 30% higher than what was promised. She noted that she will most likely hire Rou again. Rou thought that she was in some predicament... She later employs Rou to train the palace guards as well as help her stop a coup d'etat.


  • Mind Reading - It was revealed on Day 170 that Rubiria has the unique ability to read people's minds. This ability was inherited from her royal bloodline. Despite the fact that this ability has diminished in the royal family, the power is especially strong in not only herself but her mother (Albeit, her mother can only read minds when she has eye contact with others). However, she is unable to read Rou's mind and can only discern the intentions of the members of Parabellum.
  • 【God of Judgment's Divine Protection】



Upon meeting Rou, she becomes shocked that he does not treat her as a princess but rather as her superior. When she realizes his abilities are vastly greater than any in her Kingdom and that she cannot read his mind, she becomes strongly attached to him. In order to gain his favor, she becomes less arrogant and begins to stop talking down to others. She has developed a habit of repeatedly riding on his shoulder whenever they meet. Even when they're separated, Rubiria is constantly contacting Rou and coming up with cunning ways for them to spend time together, going so far as to hire him to train her palace guards.



Main Character Rou
8 Demon Generals KichiMiESeiSatoJiFuMe
18 Demon Warlords Steel CrowbackDoriane DubouéRubellia WallineAkitainuTherese East EckermannKumajirouKurosaburouScarfaceSumeragi KaedeNetsukiLiger BazetteParaberangersAuroArgentoOniwakaNicolaOpushiiGaldra Ebra
Rou's Mistresses Alma TimianoDoriane DubouéEmery FuradoFelicia TimianoRubellia WallineSpinel FeanTherese East Eckermann
Rou's Children AuroArgentoNicolaOniwakaOpushii
Named Familiars KumajirouKumakichiKurosaburouTatsushirou
Humans Therese East EckermannLord WaisuryLeviasBehnSteel CrowbackSigurd Ace SvenLiger BazetteSumeragi KaedeCervantes AlvantesQifth Del Elna
Former Slaves RamuraSuputoHazukiFuukiGenkiNetsukiIss HaaRinboToroBoss Monkey
Other ArueKirueGobujiiSuiShibainuRin
Kuuderun Great Forest
Elves Esseba Failo RheinfallMail Failo RheinfallYounger Brother Elf
Velvet's Dungeon VelvetReturner
Sternbild Kingdom
Human RubiriaMcCool SayFirst QueenFirst PrincessAlrich Tin AgbaFreed ActyGascade Barossa MeloiHoof AinSage from Another World
Kirika Empire
Human Artunel Bayard RickenbarPhilip Muskes Eagesect
Estgrand Beast Kingdom
Beastmen Lionel Gaulo EstgrandArthieChichiruta RachiraHyelda DarfusBran Bull
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Other Hyulton Gascloud AtarakuaFaransa FarkashBallark Barak
Lumen Holy Kingdom
Other Annalize Dina Einz LumenUria Dufouns SergeIshell Vorfush SergeAldra Aube EsmeraldaImruska Vares ToudorMutaiji Veidoras DinoaRan BellBrandes Dior OrchestraLovers AmorLuke
Human Kirimine AoiKiritsubo MayumiTomokui Kanata