I think it depends on what you mean by aggressive. A lot of people consider lionfish aggressive, because they usually need to be weaned from live to frozen foods. Personally, I've always found lionfish to be the exact opposite of aggressive. Unless it can fit in their mouth, they leave it alone.
Pseudochromis/Dottybacks on the other hand are usually under 3" and are meaner than most triggers. They just don't have the size/jaw power that triggers do. Most of the larger wrasses are aggressive and very brightly colored. Twinspot Maori Wrasses are about the prettiest fish IMO but they're next to impossible to find in a fish store. I've never seen one. Only pictures. Which is probably a good thing, or I'd own it lol