- Franky (science) + Nami (royalty?) = Sanji
- Brook (swordsmen) + Usopp (warrior) = Zoro
- Chopper (zoan/hito) + Robin (d clan) = Luffy
Zoro and brook is self explanatory swordsmen + death + hell. Zoro is connected to the samurai and usopp the giants. The 2 biggest warrior clans in the series
Luffy and chopper self explanatory they both ate a human fruit. There are also a lot of theories recently that Robin might be a D due to how tied to them she is