If you're looking for a pet that's energetic, playful, and independent, you can't go wrong with a kitten. When a kitten looks you right in the eyes and gives you a curious "mew," be prepared to spend the next few hours petting and stroking her.
Keeping a kitten focused is about as tough as... well, herding cats. Even so, some of the toughest warriors and most experienced spellcasters admit to bringing a kitten or two with them into battle.
Kittens can also thrive in zero-gravity situations, as is demonstrated by the following animation.