I think we all figured that at least the Roger pirates were aware of Imu, but after the encounter between Xebec and Imu, the number of characters that know is likely a lot bigger than we originally thought.
All characters that likely were aware of Imu’s existence (pre-Reverie where Sabo encountered him):
- Roger
- Rayleigh
- Gaban
- Shanks
- Buggy
- All of the Roger pirates
- Xebec
- Whitebeard
- Kaido
- Big Mom
- All of the Rocks pirates
- Blackbeard (by proximity to Rocks)
(side note all of the original yonko and new yonko except Luffy probably know about Imu)
- Kuzan
- Blackbeard’s entire crew based on the interaction with Saturn in Egghead
- Harald and possibly other giants
- I’m willing to bet Sengoku and Garp know too based on their proximity to Roger/Rocks
- also willing to bet Kong
Funnily enough, Dragon isn’t in that group.

Vasco Shot knew more about Imu than Dragon

All characters that likely were aware of Imu’s existence (pre-Reverie where Sabo encountered him):
- Roger
- Rayleigh
- Gaban
- Shanks
- Buggy
- All of the Roger pirates
- Xebec
- Whitebeard
- Kaido
- Big Mom
- All of the Rocks pirates
- Blackbeard (by proximity to Rocks)
(side note all of the original yonko and new yonko except Luffy probably know about Imu)
- Kuzan
- Blackbeard’s entire crew based on the interaction with Saturn in Egghead
- Harald and possibly other giants
- I’m willing to bet Sengoku and Garp know too based on their proximity to Roger/Rocks
- also willing to bet Kong
Funnily enough, Dragon isn’t in that group.

Vasco Shot knew more about Imu than Dragon

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