I did alot of research last night and I read that you don't have to get them in pairs unless you're not around alot, and I'm home for most of the day.
My cat is kinda weird, terrified of birds but attacks dogs. I rescued a pidgeon ad brought it home once and it flapped its wings at her and she didn't go into the back room for 5 days.
My SO and I have a lovebird, and he is definitely a feisty guy. The lovebird I had in college terrified my dog- she was a lab and the friendliest dog ever. My bird, Oz, went right after her! Katy steered clear of Oz after that.
Right now, Beaker is our only pet, but he has a ton of personality. Its true that they will bond to you if there isn't another bird. He tends to be a bit of a velcro bird, though, because it means he always wants to do what we're doing. He loves when we do dishes- he sits on the faucet. He loves drawers and shelves. He sits in our change dish and tosses all the pennies onto the floor. Half my books have strips chewed off of them. What would you like to know about them?