As fans know by now, Luffy is basically Nika, as he awakened the Nika Devil Fruit. Nika is the Sun God that brings freedom, ...

Oda avoids including mothers in adventures to emphasize the starting point of an adventure. Luffy's mother remains a mystery in One Piece, with various fan theories but no concrete answers.

According to a One Piece theory Kaido has a connection to Elbaph and he might make a comeback during the battle between Luffy and Loki.