Now that I talk about it. Tulu and Nika/Luffy have some similarities. Both just want to mind their own business but people ended up following them.
There's not much on Nika yet, so Example being like Luffy and the Strawhat Fleet. They just up and decided that they're gonna follow him. Luffy's followers are lighter. Freer. From both sides.
Tulu's is a heavy thing. His every action and inaction bearing heavy consequences, regardless of his well wish.
Also!!!! One piece have so many people claiming they're gods. Rulers. Demanding people's worship and obedience. Which Luffy decides is absolutely stupid and punches them.
Tulu however. He claim that he IS a god. But please stop worshipping him. He just wants to sleep.
How would the meeting between Tulu and Luffy go? Like, Tulu inviting Luffy and his friends to his place. To thank them for taking care of Murphy. Maybe perhaps curiosity? About Luffy's whole *Gasture at all Nika, god of freedom myth"
Well. The meeting could be nonchalant from both sides. With Luffy "I don't know why people keep calling me Nika" to Tulu "Ok"
The thing about Nika and all that, is that Nika is a made up god as far as we know and the Fruit exists because people dreamed of Nika to free them.
So Nika is what the masses want Nika to be, but Luffy as Nika is Luffy with little extra flavor of Nika on top.
With Tulu and Luffy both, though, people are going to be viewing them through the lens of 'God' first and in many cases only as God.
You're right in that they both don't want worshippers. Hah, poor guys.
Luffy and Tulu meeting...hm. Tulu, in so many ways, is very alien to the mortal experience, while Luffy is the mortal experience.
I think Luffy's first interactions with Tulu would be entirely shaped by what his crew thinks of Tulu, and if Murphy is part of that crew, then he's going to be possibly going "hey I'm going to beat you up for making Murphy sad."
Fight would happen, and then Luffy'd find Tulu pretty chill because I think Tulu might actually apologize for what happened to Murphy herself if that was a desire that was expressed.