I also did Jotaro's!!

The J is Kakyoin's colors, the O'a are his Birthstone colors again, The T is the Japanese flag, the A is one of his belt colors, the R is his hat, the K is his other belt color, the U is the colors for Part 6, the J is also Kakyoin's colors I think? I mean the Purple on the O could also represent Star Platinum.

I also did his name and his formal name, both cursive and non cursive.