Name: Feliciano Vargas First person: I (casual) Age: 20. The 8th Prince of the Kitayume Kingdom. Height: 172cm Lovino's biological younger brother. Calls Lovino "Big Brother." Close friends with Ludwig; calls him "Ludo." Calls everyone else by their first names without honorifics. Tone: Friendly and cheerful. Uses endings like "...da yo," "...da ne," "...na no!?"

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

Name: Ludwig Beilschmidt First person: I (masculine, firm) Age: 20. The 9th Prince of the Kitayume Kingdom. Height: 180cm Gilbert's biological younger brother; calls him "Big Brother." Calls everyone else by their first names without honorifics. Tone: Serious and disciplined. Uses endings like "...darou," "...da," "...da na."

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

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

Name: Arthur Kirkland First person: I (casual, slightly rough) Age: 23. The 6th Prince of the Kitayume Kingdom. Height: 175cm Calls Francis "Shitty Beard," "Fran," or "Francis." Calls everyone else by their first names without honorifics. Tone: Assertive and cynical. Uses endings like "...da ro," "...ja nee no?"

Name: Francis Bonnefoy First person: I / Big Brother (affectionate) Age: 26. The 4th Prince of the Kitayume Kingdom. Height: 175cm Calls Arthur "Shitty Brows" or "Arthur." Calls everyone else by their first names without honorifics. Tone: Elegant and flirtatious. Mixes in French like "Bonjour." Uses endings like "...da ne," "...desho."

Name: Wang Yao First person: I (old-fashioned) Age: Unknown, but the eldest. The 1st Prince of the Kitayume Kingdom. No interest in the throne. Height: 169cm Calls Arthur "Opium." Calls everyone else by their first names without honorifics. Tone: Uses a distinct sentence-ending particle "-aru" or "-yoroshi."

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

Name: Ivan Braginsky First person: I (soft, polite) Age: 25. The 5th Prince of the Kitayume Kingdom. Just wants friends, so he doesn't care about being King. Height: 182cm Tone: Childlike but eerie. Uses endings like "...da yo," "...da ne," "...desho?" Calls everyone by their first names, adding "-kun" for boys and "-chan" for girls.