Hakuren Ren (練 白蓮, Ren Hakuren) was the former second Imperial Prince of the Kou Empire.
He was a young man of average height and build, with coarse dark blue hair and slanted blue eyes. He had thin, split-ended eyebrows and a mole on his chin, in the same place as his siblings and their mother, Gyokuen, whom he most resembled. He wore traditional clothes and tied his hair in a bun.
Ten years before the start of the story, he and his brothers were caught in a large fire during a revolt set up by their own mother. He, his brother Hakuyuu, and their father were killed during this incident.
He is seen in Hakuryuu's memories. He is with his brothers, fighting against Al-Thamen in the palace, which has been set on fire. Hakuryuu asks Hakuyuu if their mother and Hakuei are alright, but Hakuyuu and Hakuren don't answer. Hakuren is the first to die.
- His name means White Lotus.
- "Hakuren" is the Japanese pronunciation; in Chinese, his name would be Báilián.
- He was the advisor of his older brother, Hakuyuu.