I'd recommend excluding peacocks from the mbuna tank.
If the "electric blue" is an electric blue hap (s. fryeri) then I'd recommend excluding them too.
If the "electric blue" is an electric blue johanni (m. cyaneorhabdos) then they'd do fine.
Demasoni's do fine if there is either one of them in the tank or 10-15. Lower numbers can lead to population implosion as a result of their intense conspecific aggression.
Establish breeding groups comprise of 1 male and 3 or 4 females for the yellow labs, blue zebra's and m. cyaneorhabdos. Go with either 1 or one-dozen demasoni's.
Demasoni's may view other blue/black vertically striped mbuna's as demasoni's and treat them as such (harshly). Electric blue johanni's are horizontally striped blue/black mbuna's and may be exempt from this aggression.
You may want to go with a yellow lab/demasoni set up (12-15 demasoni's and 6-8 yellow labs. They'll largely leave each other alone.
Rift Lake and Reef tanks.