Nika as strong as her potential allows it.
Her potential is multiversal
She is tapping into alternate universe versions of herself
Meaning it’s basically the entire infinite multiverse is at her disposal
If she can imagine herself as Pirate king, then there’s a multiverse version of herself that’s pirate king and so she can say
GIVE ME A PIRATE KING-ISH FUTURE
But don’t worry, she won’t do this because this is Oda writing her and Oda doesn’t want her to do this…
this is basically a Kid situation… We know what Kod should be capable of controlling a fundamental force of the universe like magnetism and yet look at what he does in the actual manga
For as long as Oda is the one writing these characters, they are limited by Plot and Oda’s biases… Such as Oda won’t let a woman be that strong