Now that I sort of have time again, my addition to this thread:
Cat, ~20 years old, "Puff": Puff is an exceptionally antiquated cat, sort of the Grande Dame of the household; she was obnoxious even when she wasn't elderly, and now that she's been elderly for more than half of her life, she's truly a figure of wonder and terror. That said, she's loyal and one of the brightest cats I've ever seen, and she's a good companion as long as you help her with her mobility. This cat is sort of my paradigm, as we got her when I was very wee myself and I really can't remember a time without her.
Cat/kitten, ~5 months old, "Cammy": Technically "Camellia," but she never gets called it unless my mother gets angry at her, which is admittedly fairly often. Cammy started off as a tiny, adorable kitten and has in the month afterward gotten less tiny, less adorable, and very loud and antsy. Luckily enough she's still cute enough to earn her keep, but every call home lately is "oh, god, you'll never guess what Cammy did now..."
Cat, age totally unknown, "Mr. Kitty": Mr. Kitty is the stray who lives in our carport. The agreement is pretty simple: we leave him food and let him sleep on our deck chairs, and in return he expresses a grudging affection which has slowly become less grudging. He'll never ever be let into the house, but he's sort of part of the family.
Of course, this is all at home; at college, I am sadly petless, unless you count my graphing calculator (TI-83, ~4 years, basically nameless except when I get angry, getting persnickety in its old age.)