The Lamb

The one who's quiet, shy, and has a "soft" personality, meaning they don't hurt anyone, swear, commit crimes, and they might have some sort of harmless goal, like marrying the Hero. This person is supposed to be cute because of all of these things. The Lamb is much more likely to be a girl than a guy and will never be an antagonist. They might isolate themselves from everyone else and won't talk in a loud voice as they are quiet. They use good manners and may sometimes over-apologize or be sorry for something even though they didn't do anything wrong.

The Lamb got their name from, of course, a lamb, an animal that you wouldn't expect to hurt anyone, acts a bit shy, and is found to be cute by many.

Examples of the Lamb
Naruto - Hinata Hyuga. She's the only one who truly cared for Naruto from the beginning even though everyone else in the village thought of him as a antipathy.