The biggest clue that devil fruits have spirits or souls is CP9 arc when they talked about it…
So there is a chance that Devil Fruits are actually created through the souls of the dead…
And maybe it influences their characters too… like maybe the spirit that is inside rubber fruit is someone who is joyful and all about parties, adventure…etc!
And when you think about it, Previous comments talked about how both Korozumi Higurashi and Also Strawman look like a witch of some sort… then we have Hawkins who does some voodoo doll shit and some witch craft and prediction…
Aokiji who are the Ice fruit usually loves quiet, sleeping, chill, lazy…etc!
Akainu who ate a magma has a heated personality… very hotheaded, same as Ace with Mera mera…
So, personalities are being influenced with a DF….
We have also Big Mom… who was pure innocent kid who is very kind-hearted… she ate the SAME DF as Mother caramel who was evil, by eating mother caramel herself… somehow… after quite sometime, Big Mom became also evil…
so there is a chance that previous souls inside those fruits are influencing their personality