TV-Series
Description
Grandpa Takemoto is the paternal grandfather of the protagonist, Chie, and the father of Tetsu. He lives with his wife, Kiku, not far from the family's takoyaki shop. His full name is never revealed, and he is consistently referred to simply as Ojii-chan or Grandpa.

In terms of personality, he presents as a mild-mannered and somewhat frail elderly man. He often appears to be in a state of low energy, and his health is a recurring characteristic. He has a slightly weak heart or constitution, and when confronted or stressed, he tends to clutch his chest, hyperventilate, or dramatically act as if he is about to collapse. This physical vulnerability is a key trait that defines his interactions, as he often uses it to his advantage.

Despite his delicate appearance, Grandpa Takemoto possesses a sly and cunning side. He is not above manipulating his family members to get what he wants. The most notable example of this is his frequent, successful scheme to obtain spending money from his son, Tetsu. He will approach Tetsu for an allowance or a loan, and when Tetsu inevitably refuses or tries to dodge the request, Grandpa will clutch his chest and pretend to be on the verge of a health crisis, forcing his son to relent and hand over the money. This dynamic highlights a core part of his role within the family.

His motivations are generally simple and revolve around personal comfort and small indulgences. He is not a driving force for major plot points but is a consistent source of comic relief and domestic chaos. He desires pocket money and a quiet life, but he actively participates in the family's squabbles to secure these small comforts. He shares a long and combative relationship with his wife, Kiku. The two are frequently depicted bickering, and Kiku is often harsh with him, though this is presented as the dynamic of an old, familiar couple. She is the dominant figure in their relationship, and his "health issues" seem to have little effect on her, as she is quick to scold him regardless.

His relationship with his son, Tetsu, is central to his character. He cares for Tetsu but shows it in a typically Osaka fashion, mixing affection with exploitation and tough love. He has little respect for Tetsu's posturing as a tough guy and is not above taking advantage of him for financial gain. Conversely, his relationship with his granddaughter, Chie, is much softer. While not extensively shown, he is clearly fond of her, and she treats him with a degree of exasperated affection. He also respects his daughter-in-law, Yoshie, and has a good relationship with her, which contrasts with his often-strained interactions with his own son.

Throughout the story, Grandpa Takemoto does not undergo a significant character arc or development. His function is primarily static, serving as a comedic element and a representation of a certain type of wily, elderly archetype common in Japanese popular culture. His primary ability is not physical but psychological. His talent for feigning illness to win arguments and extract money from Tetsu is his most notable and effective skill, a form of emotional and psychological manipulation honed over many years.