Kuuya (クウヤ, Kuuya) is one of the minor characters of Summon Night: Swordcraft Story 2. He is a ninja who appears in the Oni Hot Springs area and was (accidentally) seen by the protagonist and their summon beast while bathing in one of the area's abundant springs when they met.
Before meeting the protagonist, Kuuya was an arrogant ninja who dared to challenge the legendary Monkey King along with his younger sister, Kohina. Because of their recklessness, he and Kohina gained cursed scars as a result from the summon creature's attacks: one in the face for Kuuya and one in the back for Kohina. When the protagonist has Kohina confess her guilt for the incident and apologized to her older brother, he accepted her apology, saying that as an older brother, he vows to not leave Kohina no matter what happens. As a side note, Kuuya is more composed than Kohina in terms of temperance.