Suirou (翆郎) is one of the tengu living on Kurama Mountain. He is much loved within his clan for his kind heart and sweet, loving nature. When young Kurama was being abused by Jirou, Suirou protected and cared for the younger tengu, taking on the role of a beloved older brother.
He was very good at playing the flute and a very important figure for young Kurama Shinjirou. He was always there for Kurama to turn to when he was feeling down from being struck and insulted by Jirou because he could not fly.
Jirou soon got sick of this and thought that the only reason Kurama could not fly was because Suirou was constantly coddling him. Jirou brought Kurama to a deep crevice where the Raijiuyuu slept. The only was Kurama could get out was if he were to fly otherwise he was to be eaten by the Raijiuyuu.
When Suirou got word, he immediately flew into the Raijiuyuu's cave, in order to save Kurama, was unfortunately struck by lighting and lost his ability to fly. Kurama had little injuries and was able to escape.
Suirou is rather eccentric in his personality. He speaks in calm logical manners and shows affection with soft rubs from cheek-to-cheek, as he did with Kurama. He had never met another girl in his life and therefore refused to look at one such as Nanami.
The tengu of the mountain consider him very beautiful, more beautiful even than Nanami. He accepts these compliments with smiles.
Many years later he helped a young tengu named Botanmaru who also could not fly. He looked up to Kurama. Suirou lent Botanmaru crows to help him reach the lower lands and find him.
While Kurama was on his way to meet him to help Soujoubou heal with Nanami's peach elixirs, thanks to the insistence of Botanmaru. He got lost in the miasma and encountered Suirou, who had disheveled hair and was breathing out gases. Spitefulness was stamped on his face and he wished to kill Kurama to lessen the burden in his heart. But Kurama heard a flute playing in the distance and knew this was not the real Suirou and killed fake Suirou. This got him back on the track together with Tomoe, Nanami and Botanmaru.
When he met again with the real Suirou after 16 years, he bowed and said 'sorry', surprising Nanami for Kurama to show such great courtesy to anybody. Suirou responded by hugging him and rubbing his cheek to Kurama's forehead.
Suirou refused to look at girls, Nanami included. He reasoned that it was because of his many years of living, he did not know how to treat one.
Kurama is very special to him and he often comforted him after his encounters with Jirou. He loved him enough to sacrifice himself to save Kurama from the Raijuyuu and lose his wings without any regret.