Little Tabby got his name because he's so much smaller than other cats his age. While I admit that he is no longer as tiny as he was when he got that name, he still stands out as a cat who looks more like a half-grown kitten.
He's also very quiet and non-aggressive, so I have to make an extra effort to make sure he gets an adequate amount of food. If I don't keep an eye on things, other cats just take his food away. And he lets them.