I don't know, but one very popular Theory going on right now is IMU being based off Nero, who was known as a Tyrant Ruler of Rome. The funny part is his death day is set to be either the 9th of June or the 11th. Sometimes I question if oda really does this on purpose because he knows people will search for all kinds of connections to historical Figures when he reveals a name like Nerona.
11th June is the official release of chapter 1086
9th June the other speculated death date could be for the Unofficial readers(we used to get them on Fridays).
I am Him - Eiichiro Oda.