The informant gave out the following piece of folklore at my request. They are of Chinese descent, and the setting was casual.
They said that for people born under the Year of the Ox, wearing a rat, rooster, or snake charm is “good” for them. When asked what that meant, they said that the charms are like friends.
This was interesting, because most charms I hear of are for good luck, wealth, and similar ideas. But similar to them, it may be a charm for more friends in the future, in addition to an animal figurine actually being a companion of sorts. The informant also mentioned that it does not have to be a charm; one can wear the complementary zodiac animals in any form.