Ever since information around One Piece Chapter 1179 has been released, the fandom has been incredibly active. Eiichiro Oda finally decided that it was time to reveal Imu's full form, which effectively was enough to shake the readers. While most of the fandom is talking about what his powers could be or why Imu finally decided to physically come to Elbaph, there is a part of the One Piece community that wants to know more about his obsession with Vivi.
As we now have confirmation that Imu is a male character, one major speculation goes out of the window that he was behind her body. Now the discussions have shifted from this popular theory and evolved towards something more compelling: What could Imu's intent be with her? In the One Piece manga, when he was talking about he it is important to note that he does not say he needs her.

Rather, Imu says that he desired her; this subtle distinction has caught the attention of the readers as it carries narrative weight. If Vivi was someone he needed for the power of use her for survival, Imu would have used a different type of language. What he had said earlier seems like there is a personal touch to this.
One Piece fans are now discussing whether Imu being fixated on Vivi could be beyond him stratergising to maintain his power. This could be a reaction to an emotional trigger, and possibly he is obsessed. Interestingly, being obsessed would even make sense because Vivi's ancestor was Nefertari D. Lili. She was one of the few rulers who actually rejected the role of becoming a Celestial Dragon and openly opposed the World Government.

If we were to see these events from Imu's perspective, her rejection is not just a simple political disagreement. His personality is always obsessed with destroying anything or anyone who would seem as a threat. So Lili not choosing to become a Celestial Dragon would have been as equal as betrayal in his eyes because that ended up changing the course of history. And now, Vivi being the descendant might remind him of the past.
This leads to the idea that Imu might only be interested in Vivi to get revenge. After he had ruled over the world in the shadows for 800 years, he could see Vivi as the last remnant of Lili's will. It might be his major motivation to erase her and close this chapter once and for all. In One Piece, Vivi may remind him not just of betrayal, but of something he could never control.
Imuβs true nature in One Piece is finally reflected in the Elbaph arc

This idea has become interesting when we also consider how Imu actually looks. According to what we see in One Piece Chapter 1179, he has traits from multiple races, like the Oni-like horns, Lunarians ' features, which could have possible connections to the Three-eye tribe.
Fans speculate that Imu might not belong to a single race at all, but could instead be the origin of several races in the One Piece world. If that happens to be true, then Viviβs importance could extend far beyond her lineage; she might be tied to the balance of the world itself.
Final thoughts
In the end, the most convincing explanation is that Imuβs interest in Vivi is not about simple utility. It is a mix of obsession, history, and symbolism. Vivi represents Liliβs rebellion, the unresolved past, and possibly even the key to the worldβs true origin. Imu does not just want her because he needs her; he wants her because she embodies everything he has tried and failed to control.