The aggressive damsel in my tank chases everything up to, but not including, the Blue Tang and the larger of the two Javanese damsels, if they happen to get too close to it's cave. It also gets beside itself with frustration/rage if I dare to re-arrange the sand near it's cave and will spend several frustrated hours getting it right again (funny to watch but I feel a bit mean doing it).
When I put in the Regal, I also put in a Yellow Tang and three Yellowtailed blue damsels plus stuck 3 mirrors up around the tank. The combination of the new fish and all the reflections caused the damsel to get so wild it attacked every other fish in the tank (the plan to divert attention from the Regal certainly worked in this respect). I actually got a bit worried as it was obviously loosing many of it's fights and it's fins became more and more ragged. Luckily he/she carmed down after a day or so.
I look after another tank, about 25% bigger than mine and it contains a Flame Damsel that will often bite me.
Perhaps my tank is an exception with only one really aggressive fish out of 7 damsels and 4 chromus, but I do not know why that would be so. I have to admit, I rather like damsels.
Steve