Nika #1 does not appear to be a DF user. As we can see from the silhouette of Joyboy and G5 Luffy, the Nika fruit’s full power has the white cloak indicating DF awakening.
Nika #1 does not seem to have this white cloak, whereas it does have the signature white Nika hair.
Could this indicate that Nika #1 was not a DF user, but rather some sort of ancient primordial entity that like Ratatoskr, essentially became a DF power?