Most aggressive fighters

The Prince wasn't all that aggressive. Hagler could be aggressive (Hearns fight) and attack but it wasn't his usual style. Norris could box and use movement, but his instinct was to brawl. Chavez was great at applying intelligent pressure, although he had respectable boxing skills too.

When I think of aggression, I think of guys who are usually coming forward and applying pressure, so I think more about guys like Frazier and Pryor.