The story that the guard talked about with a CP9 agent and was later vanished, was in the "ancient times". So this must means that the story is information about the void century.
Sun god Nika (or maybe Sungo D. Nika ?) bringing joy to others and wanting to stop slavery, should be the first Joy Boy's real name.
We know the poneglyph that has Joy Boy's wish was at fishman island, so it can also relate with the name of the Sun Pirates.
*Sorry if others already posted similar speculations.*
Sun god Nika (or maybe Sungo D. Nika ?) bringing joy to others and wanting to stop slavery, should be the first Joy Boy's real name.
We know the poneglyph that has Joy Boy's wish was at fishman island, so it can also relate with the name of the Sun Pirates.
*Sorry if others already posted similar speculations.*

