Loaches, tons of shrimp, plants, and something that won't be dedicated to eradicating every last shrimp in the tank... You could go with a guorami of some sort, or have a small group of mollies, platies, or swords (my mollies always come out when I enter the room).
Not sure. I actually don't have all that many big personality fish, and the ones that I have are in dedicated tanks (
goldfish and bettas), so I'm not a ton of help here.
You can do neons with whatever spare space you have. They look awesome in planted tanks. I particularly like the black neons.