Movie
Description
Bonobono's father is a male sea otter and a central supporting character in the story. He is the parent who names his son Bonobono, though he almost always affectionately shortens this to Bono. His own name is not given; he is simply referred to as Bonobono's father or Mr. Sea Otter by other adult animals.

In his daily life, Bonobono's father presents a calm, slow, and somewhat absent-minded demeanor. His movements are unhurried, and his speech is deliberate, often with pauses that make him appear foolish or dumb. This gentle, laid-back personality is consistent throughout the series, and he rarely shows signs of anger or haste. He is a devoted single parent, raising his son after the death of his wife. Despite his own grief, he is determined to be a good father and role model, teaching Bonobono important lessons about life, kindness, and compassion.

Beneath this placid exterior lies a remarkable and unexpected past. In his youth, he was known among killer whales as the sea otter god of death, a legendary being so formidable that even the killer whales, who are natural predators of sea otters, would not dare to attack him. This fearsome reputation stems from an incident where he was swallowed whole by a notorious, villainous killer whale. He remained completely calm and unharmed, emerging as if nothing had happened, which instilled a deep and lasting fear in the whale community. He is on friendly terms with a killer whale named Scar, who witnessed this event, and occasionally visits him in his territory. His strength is also demonstrated in more mundane ways, such as when he wins a duel against the Brown Bear Captain over the use of a sandy beach.

His most significant relationship is with his son, Bonobono. While he appears slow-witted, he is a source of stability and wisdom for his child. He is the one who finds and helps rescue the drifting kitten who becomes Bonobono's friend, Yaong. He also maintains friendships with a variety of other animals, including a group of sharks and other sea otters, showing he is well-respected in his community.

The character has a hidden depth revealed through the story of his past. He was once married to a whale named Hoeru, a childhood friend of his. After Hoeru died in a tsunami caused by an earthquake, Bonobono's mother was overwhelmed with grief. The father tried to comfort her, and they eventually had a son, Bonobono. However, his wife could not overcome her sorrow and guilt for being happy after her friend's death. She eventually disappeared, leaving behind only their newborn baby. The father was devastated, crying every day and wasting away in sadness, just as his wife had. He was eventually persuaded to live for Bonobono's sake. He came to view sadness as an illness, one that he decided to live with and endure, believing that life itself would eventually make things better. This philosophy defines him: he carries his sorrow but chooses to move forward for the love of his son.

While his slow and clumsy appearance is his default state, he possesses notable abilities. His physical strength is considerable, as shown when he blocks an entrance with a huge rock. His most impressive ability is a peculiar swimming method he uses to travel through killer whale territory without being attacked, a technique his son later mimics to escape danger. This method signals to the killer whales that he is not prey, but the legendary reaper they fear.