who is luffy grandfather

It could be an old and powerful wizard who has been in hiding for years. Maybe he was a friend of Dumbledore's but had some differences with him, so he stayed away from the main events in Harry's life until now.

Nami could also be a common character. She might help Luffy manage the financial aspects of his admiral duties, as well as use her navigation skills to assist in any navy - related voyages. And of course, she'd be there to keep Luffy in check when he gets too carried away.

Great-grandfather, great-grandfather, and great-grandfather were the Chinese names for family members. According to the information provided, his great-grandfather was the third generation, and his great-grandfather was the fourth generation. However, there was no clear explanation regarding the Mystic Ancestor in the information provided. Thus, it was impossible to determine the seniority of the Mystic Ancestor.

Rayleigh would be a great candidate. He's an experienced pirate and has already trained Luffy for a while. He has a lot of knowledge about the world of pirates and could give Luffy a talk about the deeper secrets of the Grand Line or how to deal with the powerful enemies that lie ahead.

He could be a powerful and respected shinobi from the Uzumaki clan. Given the Uzumaki's reputation for strong chakra and unique abilities, Naruto's grandfather might have been a key figure in the clan's history.

Liu Bang's grandfather was Liu Qing. Liu Qing was a doctor in Wei at the end of the Warring States Period. Later, he moved to Feng County and was buried in the ancestral tomb of the Han Emperor. Liu Qing was Liu Bang's grandfather, the origin of the Liu family.

Huo Jianhua's grandfather was Huo Weisi.

Fan Xian's grandfather was a secret. The novel did not reveal who Fan Xian's grandfather was. Thus, Fan Xian's grandfather's identity was unknown.

Fan Xian's grandfather was Xiao En.

Han Xue's grandfather was Han Shu.