I felt like I should share this here to clarify Luffy's devil fruit name.
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Kaido's devil fruit is "Uo Uo no Mi,
Model: Seiryu", meaning it's a Fish that evolved into an Azure Dragon but he is a Dragon, not a Fish.
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X Drake's devil fruit is "Ryu Ryu no Mi,
Model: Allosaurus", it's a Dragon that evolved into an Allosaurus but he is an Allosaurus, not a Dragon.
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Luffy's devil fruit is "Hito Hito no mi,
Model: Nika", meaning he is Nika but not just a simple human.
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Chopper's devil fruit is "
Hito Hito no mi" without a model and this just means "human devil fruit" and has nothing to do with Luffy's. It's a disambiguation.
In fact, Luffy's devil fruit is not the first nor the second one of the "Hito Hito no mi, Model" class.
- Hito Hito no Mi,
Model: Daibutsu:
https://onepiece.fandom.com/wiki/Hito_Hito_no_Mi,_Model:_Daibutsu
- Hito Hito no Mi,
Model: Onyudo:
https://onepiece.fandom.com/wiki/Hito_Hito_no_Mi,_Model:_Onyudo
- Hito Hito no Mi,
Model: Nika