I found them to be similar in personality to lovebirds. Cuddly and animated, and with a need for daily interaction with their human "mates" for them to stay tame and loving. Some learn to talk.
List of members:
Amazonian Parrotlets (Dachilleae)
Blue-winged Parrotlets (Xanthopterygius)
Brown-backed Parrotlets (Melanonota)
Celestial or Pacific Parrotlets (Coelestis)
Golden-tailed Parrotlets (Surda)
Green-rumped Parrotlets (Passerinus)
Mexican Parrotlets (Cyanopygius)
Red-winged or Blue-fronted Parrotlets (Dilectissima)
Sapphire-rumped Parrotlets (Purpurata)
Scarlet-shouldered Parrotlets (Huetii)
Seven-colored Parrotlets (Batavica)
Spectacled Parrotlets (Conspicillatus)
Tepui Parrotlets (Panychlora)
Turquoise-rumped Parrotlets (Spengeli)
Yellow-faced Parrotlets (Xanthops)
More details about species...