Chopper and Imu may both be forest entities
Quite a few things lead me to believe this.
First of all when Imu first arrived, the trees and the wood started to demonically laughing
There was also a quote in the second world “the forest god tamed demons while the sun spread the fires of war” both mentioned in the same sentence. Forest and fires are antagonistic. The only two confirmed antagonistic parties in the second world we know is Imu and Joyboy. Joyboy was most likely the previous user of the Nika fruit.
Now regarding Chopper, he can tame demons and specifically turn them into more human. U can argue it’s a normal human fruit ability but I would like to go deeper than that.
Chopper is the good side of the forest. He can cure people of their sickness. While Imu represents the evil side of the forest, the poison as an example.
Another foil is, both Imu and Joyboy were very likely to have been friends one time, similar to how Chopper and Luffy are friends now.
The parrot theory would also be a good example to relate Imu to Chopper but we don’t have enough proof for that.
I do think just like there being two sides of Nika, there can possibly be two sides of other gods as well.