They definitely can be mean if they aren't tamed. I think a lot of it is that they are much smarter than their size would indicate, and they get their names from how devoted they can be. So they need someone (another bird or a person) to obsess over- if they are paired with another bird, they've got no use for you. And if they love you, they're a velcro bird. Ours is super sweet (likes having his cheeks scratched, gives kisses, and loves to ride around on your shoulder) but he can be loud if he feels left out of the fun- especially if you're on the phone, he tries to join the conversation. He's also smart enough to recognize patterns, and does not get out of his cage when we open it in the morning to feed him, but does hop out immediately when we open it in the afternoon because that is when we let him out.