Disclaimer: Currently I only raise peafowl. I do not have any other kind of bird. I am writing this article to give you ideas of what I have seen people commonly keep with peafowl. I haven't tried any of these combos on my own, so be aware of that please.
The Red Golden pheasant is perhaps the most common aviary companion to the peafowl. Many, many, many people keep the two species together. A local peafowl breeder was trying to give me Red Golden eggs telling me that they can live in the same pen as the peafowl. I didn't take his offer, but someday I might get some Red Goldens. I can't think of any major issues in keeping Red Goldens with your peafowl. Since Red Goldens are smaller than peafowl, you may have to watch out for any aggression. To be safe I would give the Red Goldens a small space to hide in encase the peafowl chase them a little bit. With so many people keeping Red Goldens and peafowl together, I am sure you can make it work.
I think the same applies for these pheasants as what applies for the Red Goldens.
Just a word of caution. I personally would not keep chickens in the same pen as peafowl. Chickens can give peafowl blackhead, which will quickly kill the infected peafowl if not treated soon enough. You can treat them and save them, but it is a nasty thing for them to catch. I wouldn't want to chance it, but many people successfully keep chickens in with peafowl. There has even been a rare chicken x peafowl cross resulting from the rare mating of a peafowl to a chicken. As far as the peafowl picking on the chickens, you would have to just keep an eye on them. Make sure you keep all of the birds on a regular worming schedule to prevent any blackhead issues.
That is all I know to get you started. I am sure there are other pheasants you can keep with peafowl. I wouldn't keep turkeys with peafowl as the tom and the peacock could get into fights and hurt each other.
Each person's situation varies, and many factors should be taken into account such as the aviary size, varying temperaments, breeding season behavior, etc.
You should always have enough pens so that if a mixed aviary setup does not work, you can easily put the peafowl or other birds into their own pen.
Once again I have never had a mixed aviary, but I have seen and read of many people who do keep several varieties of birds together with peafowl. Zoos often house several bird species together as well so this isn't a new idea, but you still have to do a little experimentation on your own to see what sort of set up works best for you and your birds.
