Dragon blood is very mean peacock. They don't look mean in the LFS. Make other moderately aggressive mbunas look like poodles...
Also, if you do get multiple peacocks. You do have to be quite selective. I would not get hybrid peacocks. Also, you would need to be prepared to possibly rehome something. The personalities on these things just vary. The compatibility charts they have are a nice starting point, but also at times laughable because I have had the peacock kill fish that are supposedly completely compatible with it.
It unfortunately just really depends on individual temperament to a point.
Just from our experience, the dragon blood has killed 2 other peacocks and a red empress. It is also king in a tank with a zebra, blue dolphins, etc. All Africans. Blue dolphins can be nasty fish too. Nippy things!