Blue Mickey Mouse platy it is... Do they do well schooling?
They aren't really a schooling fish like the other types you have selected. In the past, mine would pair up or form little groups and swim together, but much like your danios, they kind of just swim all over the tank.
If you plan to get several of these, make sure you keep them in at least a 1male :2female ratio. I currently have 2 males and 2 females, and it isnt working out so great. The blue male is bigger then my other one, and he is constantly chasing and bullying the smaller one. I plan to put the pairs in seperate tanks and get 4 more females so each set is 1:3. When I had platys before they were in a 1 male : 3 female ratio. I never had problems with them.
Here is a website with good pictures to tell the sexes apart. Its super easy. That way you can look at all the fish, pick the exact ones you want, and you will know you have a good ratio. I find the people at the fish store dont always know how to sex them.
the Smiley Fish
Another thing to consider is that platys are livebearers, which is part of the reason I really like them. If you get several females and 1 male be prepared for offspring. Your tank doesn't have any fish that would eat the babies. Maybe the barbs, but I don't think so. I dont actively breed the platys, so if they mate and have babies I just leave them in the main tank. If they live great, if not oh well, but that's up to you. My angelfish currently think they are a tastey snack, but you dont have a predator fish. Because your tank is so big, and your stock is so low, reproduction wouldnt be a huge issue. Just be aware that you could wake up one day and have a few baby fish in your tank. It isn't like they produce 100 babies each time. I'd say mine had 2-5 babies that survived each time when there were no predators in the tank. After a while, if you feel like you are getting too many, you can check and see if your local pet store would buy them or take them from you.
If you do not want anything to do with having babies get all females obviously, but also make sure when you get them from the store that they dont look puffy. Puffy females = pregnant females, and if the 1 female has 4 babies 1 could be male and you now get to keep the cycle running. Look for the smallest skinny females that probably haven't matured yet, but still look healthy. You'll just have to see what you can find.
Sorry this is so long. Just wanted to make sure I covered everything. I do love me some platys.