TV-Series
Description
The character referred to as Ohni appears in Children of the Whales under the name Ouni. He is a sixteen-year-old Marked youth living aboard the Mud Whale, a drifting island vessel, where he leads the Moles, a group of troublemakers who constantly break the island's rules. Ouni is widely considered the most powerful user of thymia among the Mud Whale's inhabitants, a reputation that makes even the island's elders uneasy. He has long dark purple hair usually tied back in a messy ponytail, purplish navy eyes, and often wears a necklace with a rectangular pendant. Small white puffball-like creatures called Mud Moths, which glow blue in the dark, are frequently seen floating near him. He is regarded as one of the most striking and stylish residents of the Mud Whale and is rumored to have started a fashion trend among the island's young Marked men.

Ouni's origins are mysterious. He appeared on the Mud Whale with no known parents or connections to any established group, and he grew up as an outsider. His closest relationship is with Nibi, who befriended him during a shared punishment and encouraged his dream of seeing the world beyond the island. This friendship gave Ouni a sense of purpose and belonging, and their circle of friends eventually became the Moles. Later in the story, Ouni is revealed to be a daimonas, a being created on the Mud Whale from the emotions and love of an early leader named Taisha. His aura is identical to that of Miden, an earlier daimonas, linking him directly to the vessel's hidden history.

In personality, Ouni is rebellious, aloof, and emotionally distant on the surface. He openly defies authority and resents the restrictions placed on the island's people, but underneath this defiant exterior he genuinely cares for those close to him, especially the Moles, and acts as their unofficial guardian. He longs for connection and acceptance and fears being rejected by the very people he wants to protect if they learned the truth about his nature. He also has a creative side and an eye for style, and he unintentionally influenced how many of the island's young men dressed.

Ouni's central motivation is his strong desire to leave the Mud Whale and see the outside world. He views the island as a prison for people who are destined to die young, and he believes that escaping it is the only way to truly live. This drive brings him into conflict with the island's elders and established order. When a girl named Lykos is discovered on a derelict island, Ouni takes her away and pushes toward the outside world he has always wanted to reach, with the archivist Chakuro acting as his guide.

Over the course of the story, Ouni develops from a defiant troublemaker into a committed protector. He is initially skeptical of Chakuro, but he comes to respect the archivist's resolve and becomes a vital ally in the fight to defend the Mud Whale. He is forced to confront the harsh truth that the freedom he sought beyond the island is filled with even greater violence, and he gradually steps into a leadership role, using his immense power to protect the home he once wanted to abandon. His hatred for Orca, an enemy commander who exploits his daimonas nature, defeats him, and abducts him, becomes a source of deep trauma and anger.

Relationships are central to his growth. Nibi is the person closest to him, and after Nibi's death Ouni cries for the first time, expressing that without Nibi he would never have found a reason to live. Kicha, a childhood friend, cares for him deeply and wishes he would let others in and express his emotions more openly. His relationship with Suou begins with distance but evolves into mutual respect and friendship as they work together in battle. He initially resents Shuan, who draws attention to his identity as a daimonas, but the two gradually form a bond rooted in their shared experience.

In terms of abilities, Ouni possesses the strongest thymia on the Mud Whale, surpassing even the leader of the island's defense force. Unlike ordinary thymia, which is indirect in its effects, Ouni's power can directly destroy and cut through objects, and he is capable of devastating multiple warships at once. He can also use thymia in the Hysterion, the ship's inner womb district, a place where thymia normally cannot function, which causes enemy soldiers to fear him as a demon. However, using his power in that space carries a heavy cost: afterward he loses his thymia ability and develops strange markings on his body that gradually spread. His existence is also tied to the Mud Whale itself, as he draws on the spiritual residue of its people and cannot survive for long far away from them.