Maybe, who knows. It will be something that will basically go beyond the concept of "a human being bad villain because of bad past."
For me, I actually before the existance of Imu-sama, I always had fascination with the story of Devil Fruits, and linking it to that final entity that Luffy is going to face.
you see, do you recall what the story behind DF that was mentioned??? It was said that Devil Fruit powers are the reincarnation of the power of the "Sea Devil". Which is actually can be a REAL entity that was suppressed long time ago, and its own powers were reincarnated in the form of Fruits and scattered rather than being in one single invincible entity.
Now, I'm not saying Imu is a Sea Devil, or anything. BUT MY POINT is that Imu has to be an entity that represent the 800+ years of wars and suffering in the world of One Piece, and not just a pitiful human who took the wrong path as a human because of bad past