This paper toy is a chibi Shi Seiran, the sole remaining retainer in the personal household of Kou Shouka, who took him in thirteen years ago, based on the Japanese light novel series The Story of Saiunkoku (aka Saiunkoku Monogatari), the papercraft is created by Larry-San.
Since then, Seiran has repaid that kindness by protecting Shouka's family, performing repairs, and taking small outside jobs to earn money. He is a very skilled fighter and swordsman, and despite his amiable disposition, can be ruthless to people who endanger his loved ones. He has known Shuurei since her childhood and is very protective of her, but prefers to watch and help from the shadows.
Seiran is later revealed to be Shi Seien, Ryuuki's second-eldest brother, who had been known as the "flower" of the royal princes due to his physical and intellectual superiority as well as for his kind heart. This encouraged a conspiracy by Seien's maternal relatives to make him the next Emperor, but their plot failed. Seien was exiled with his unloving mother, Lady Shi Suzuran, who was killed by the assassins sent after them by the other imperial concubines.
Left alone in the distant Sa province, he joined Satsujinzoku, a murderous band of thieves who nicknamed him "The Little Whirlwind". Ro Ensei joined the group as well, and the two destroyed the band from within. Afterward, Shouka Kou found the young prince in the wilderness and took him in, giving him the new personal name 'Seiran', meaning 'Silent Orchid', as well as the surname 'Shi'.
Seiran has since embraced this new persona and does not discuss his past, although some characters become quietly aware of his former identity. Though he claims to be 21 years old, he is actually 26 years old at the start of the series. [Source: wikia]
You can download this papercraft toy here: The Story of Saiunkoku - Chibi Shi Seiran Free Paper Toy Download [Instruction]