While I can't really speak for others, mine is a nasty old bitch who nags at me for doing whatever and hates me for no reason, but would jump in front of a fucking bullet for by goody two shoes sister.
the one who loves you, but can also tell if you: 1)took a shower in the past 2 days 2)what you ate yesterday 3)ditched class 4)got hurt 5)got a girl friend, or boy friend.
She can also find anything ever, and cares and loves for you so much.