I would advise against putting an angel in a 36... personally I think the adults are just too big (tall) for anything short of a 55 gallon, where 75 is better, and tanks that size are better for their often-times territorial nature.
I assume by BP you mean blood parrot, which is another no-go. Too big for this size tank, reaching up to 9 inches in length.
If you want cichlids, Bolivian rams work very well in something this size, and are hardy and have tons of personality.
Pearl gouramis are also a good suggestion, though I've found them to be a little more sensitive to pH. They are a little shyer and will take up the top parts of your tank, but they are certainly beautiful and are a little more docile as far as gouramis go.
I definitely encourage you to try cories! They are a wonderful little fish that comes in so many different species (and sometimes multiple varieties within species), just remember to keep at least 5.
Instead of adding another tetra species, I would recommend adding more Harlequin rasboras, as they will only feel more comfortable the more individuals you add, and you might start seeing more natural schooling behaviours.
This is just a suggestion but based on what you want from your tanks, I think it could work out nicely!
10 Gallon
1x betta
36 Gallon
1x pearl gourami OR bolivian ram (or something similar in size/temperament)
10x Harlequin rasboras
5-7x corydoras (number is species-dependent)
3x Balloon mollies
2x platies (from your 10 gallon)
A bristlenose would be a fine addition to a 36 gallon but be aware that as far as algae eaters go, they add a ton of bioload to your aquarium.
