Passage: Chan (ちゃん) is a diminutive suffix; it expresses that the speaker finds a person endearing. It is seemingly said to have come from a "cute" pronouncing of -san (in Japanese, replacing s sounds with ch sounds is seen as cute), although there is no evidence otherwise as this suffix has been used since the early days of ancient Japan. In general, -chan is used for babies, young children, close friends, grandparents and sometimes female adolescents. It may also be used towards cute animals, lovers, or a youthful woman. Using -chan with a superior's name is considered to be condescending and rude.

Question: what lets a person know the speaker finds them fond?
Chan (ちゃん)