[Question] Guess how many characters have been in every single arc thus far.

[Fujitora]

The answer: Monkey D. Luffy, Roronoa Zoro, Pandaman.

Spoiler

:snick:

 

[SAHAN1993]

so my final answer zoro,luffy,pandaman[pandawomen amazon lily arc]

seagulls as a living thing zoros katana and luffys straw hat as inanimate objects

 

[LitzSabr]

But how many chapters was that in the manga?

Nami was introduced in chapter 8 in a different way, if that's what you are asking.