I'd wager that they are actual devils and that they are the precursor to devil fruits since the five elder planets have multiple abilities. I've also read online that the Gorosei are a foil of the Vegapunk satellites so the theory that Imu is the inventor of all devil fruits is still very much possible.
i've come across that theory in the last couple days and i think it's intriguing. i've also seen the similar theory that transforming them and teleporting them is related to imu's devil fruit.
spoiler
I'd wager that they are actual devils and that they are the precursor to devil fruits since the five elder planets have multiple abilities. I've also read online that the Gorosei are a foil of the Vegapunk satellites so the theory that Imu is the inventor of all devil fruits is still very much possible.
spoiler
i've come across that theory in the last couple days and i think it's intriguing. i've also seen the similar theory that transforming them and teleporting them is related to imu's devil fruit.