Kuroi Ryuuji

Kuroi Ryuuji, known as the King of Incubus and Succubus, is on a mission to find a bride and take over the Dark World, with plans to turn Taimanin into his slaves and soldiers. He is a sinister and devious man who speaks in the pluralis majestatis and desires power. He refer to himself as we/us when talking to people that knew his true origin or form but when in disguise or pretending he speakes normally. Kuroi uses carnality to brainwash people into joining his army, but he is careful not to reveal his true identity. He sees violation and love as one and the same, and values corruption and perversion in his targets.

Kuroi is a dominating presence who demands total obedience from his subjects and pawns. He enjoys degrading and humiliating strong women, but is hard to please and views almost everyone as a tool. As a highly ranked Incubus, he is very lustful and is intrigued by those who harbor dark secrets and desires that he can exploit. Kuroi is able to read people's desires either supernaturally or instinctively, and is quick to come up with a plan. He is cunning and doesn't reveal his true intentions or nature easily, only giving away slight dark smiles that hint at his intentions.

In battle, Kuroi reacts calmly and precisely, testing his enemies rather than fighting as if he is in danger, even if that is not the case. He is highly skilled and intelligent, making him a formidable opponent. In his civilian disguise, Kuroi is always at the top of his class, and although some dislike him, others swoon over him. He remains rather solitary, becoming rude and short-tempered with his maids and even violent.

Kuroi is a tall, darker-skinned man with white hair. He typically wears long black pants and a black suit. In his demon form, he transforms into a black-winged Lovecraftian monster that stands at around 10 meters tall. He has two horns and giant hands with sharply tapered fingers. Bat-like wings with sharp points at the end protrude from his back, and tentacles stretch far from his mouth. His tail splits into two, partway down, and is thicker and longer than any snake.