When gathering information on a pit bull's temperament you will start to notice that pit bulls are very kind hearted animals. If a pit bull has the correct temperament, the dog would be friendly towards friends, family, and even strangers. This is a reason you should never consider having a pit bull be a guard dog as they are way too human-friendly, always seeking affection from their human counter-parts. Pit bulls are also great for family households and even around younger kids. With this being said you should hardly ever see any human aggression from these dogs.
Dog and animal aggression on the other hand can be different, but it relates differently from dog to dog. Each dog is different and has its own personality so you cant always judge a pit from another pit bulls actions.
Pit bulls begin showing their dog aggression signs around 2 and 3 years of age but if socialized and trained correctly you should have no problems. One common trend with pit bull owners after getting one pit bull is to want to get another, but I caution this because pit bulls are more aggressive when combined with the same sex. I do know many people that have more than one and are great, but it all depends on how you raise them.
Most pitbull owners who have properly trained and soicialized their dogs correctly will say they are just big couch potatoes that love to get attention. Its a perfect dog if your looking for the perfect companion!!