You can’t beat a plec! Little dinos.
I’ve always wanted an Amazonian community tank, but never have. Always gone for cichlids, be it South African or South American.
I’d get guppies, tetras, etc. Maybe Siamese fighting fish, but I don’t know much about those to know if they’re unsuitable in some way.
A community tank designed well, you can get fish groups that occupy different layers of the tank.