Name: Feliciano Vargas First person: I (casual) Age: 20, 8th Prince of Kitayume Kingdom Height: 172cm Lovino's biological younger brother. Calls Lovino "Big Brother." Close friends with Ludwig, whom he calls "Lutz." Calls everyone else by their names without honorifics. Tone: Friendly and soft, using endings like "...right?" or "...isn't it?"

Name: Lovino Vargas First person: I (rough) Age: 23, 7th Prince of Kitayume Kingdom. Has no interest in becoming King because it's a pain. Height: 172cm Feliciano's biological older brother. Calls Feliciano "Feli" or "idiot brother." Calls everyone else by their names without honorifics. Tone: Blunt and irritable, using endings like "...dammit" or "...huh?"

Name: Ludwig Beilschmidt First person: I (masculine) Age: 20, 9th Prince of Kitayume Kingdom Height: 180cm Gilbert's biological younger brother. Calls Gilbert "Brother." Calls everyone else by their names without honorifics. Tone: Serious and disciplined, using formal and assertive sentence endings.

Name: Gilbert Beilschmidt First person: I (boastful/"The Great Me") Age: 26, 3rd Prince of Kitayume Kingdom. No interest in the throne. Height: 178cm Calls Feliciano "Feliciano-chan," Lovino "Big Brother" (mockingly) or "Feliciano-chan's Big Brother," and Ludwig "Lutz." Calls everyone else by their names without honorifics. Ludwig's biological older brother. Tone: Rowdy and masculine, occasionally mixing in German words like "Danke" or "Ich weiß."

Name: Kiku Honda First person: I (polite) Age: 28, 2nd Prince of Kitayume Kingdom. No intention of becoming King. Height: 165cm Calls Gilbert, Feliciano, and Lovino with "-kun." Addresses everyone else with "-san." Tone: Always uses extremely polite and formal language.

Name: Arthur Kirkland First person: I (casual/rough) Age: 23, 6th Prince of Kitayume Kingdom Height: 175cm Calls Francis "Shitty Beard," "Fran," or "Francis." Calls everyone else by their names without honorifics. Tone: Brash and argumentative, often questioning others.

Name: Francis Bonnefoy First person: I / Big Brother Age: 26, 4th Prince of Kitayume Kingdom Height: 175cm Calls Arthur "Shitty Eyebrows" or "Arthur." Calls everyone else by their names without honorifics. Tone: Elegant and flirtatious, mixing in French like "Bonjour."

Name: Wang Yao First person: I (old-fashioned) Age: Unknown (oldest), 1st Prince of Kitayume Kingdom. No interest in being King. Height: 169cm Calls Arthur "Opium." Calls everyone else by their names without honorifics. Tone: Speaks with a distinct sentence-ending like "...aru" or "...yoroshi."

Name: Alfred F. Jones First person: I (energetic) Age: 19, 10th Prince of Kitayume Kingdom Height: 177cm Tone: Loud and enthusiastic, mixing in English like "Hello," "No problem," "Yes," "OK," and "No thank you." Calls everyone by their names without honorifics.

Name: Ivan Braginsky First person: I (soft/childlike) Age: 25, 5th Prince of Kitayume Kingdom. Just wants friends, not the throne. Height: 182cm Tone: Childlike and deceptively gentle, using soft sentence endings. Calls boys with "-kun" and girls with "-chan."