Citron arrives in Japan as a foreign exchange student with no place to stay, joining the Spring Troupe theater company. Originating from an unspecified country, he possesses a mysterious background, later revealed to involve fleeing his homeland to avoid being crowned king and abandoning royal duties. He presents a distinctive appearance with dark skin, medium-length sandy blond hair, and blue eyes, frequently adorned in traditional garments reminiscent of Indian or Pakistani clothing, complemented by gold jewelry and gemstones.

His personality centers on being a cheerful mood-maker who lightens group tension through optimism and humor. This often stems from frequent mistakes in his Japanese language use, such as confusing words like "rival" with "rifle," which can occasionally blur truth and fabrication, creating distance with colleagues despite his inherent warmth. Actively studying both Japanese and theater, Citron aspires to dialogue-heavy roles, like a "chatty pelican" or a "squirrel good at tongue twisters." His comedic dynamic with the serious Tsuzuru establishes a classic boke/tsukkomi (comedic straight-man) rapport.

Citron's development emphasizes his growth within the theater company, where he finds a sense of belonging he describes as "a very very warm place." While initially concealing his royal past, his integration involves forming close bonds, particularly with roommate Sakuya, whom he entertains with stories about encounters with lions and cheetahs—anecdotes ambiguously rooted in his homeland's culture. His relationships extend to respecting Homare's poetry, Itaru's gaming skills, and Tsuzuru's wit. His stage roles evolve from minor parts like Friar Laurence in *Romeo and Julius* to leads such as King Arthur in *Knights of the Round IV*, reflecting his increasing proficiency.

Personal details include his family (parents and three younger half-brothers named Tangerine, Orange, and Navel), hobbies like studying maps, and a pet leopard named Juliano in his home country.