Harmony is a loving and kind Ham-Ham. She likes to help people with their relationships. She hates it when Spat messes with people's love. She always tries to help when something goes wrong. She shoots love arrows at Ham-Hams to make them love again. She is in an angel costume. She never made an appearance in English TV series, but she was a major character in Hamtaro: Ham-Ham Heartbreak and a few other episodes.
She may have a crush on Boss, because when she was at the Clubhouse in Ham-Ham Heartbreak she said she enjoyed it there very much and she was with Boss a lot and taught him all of the ham-chats that she made herself. She also may have feelings for Spat, but that is unconfirmed. She seems to get tired of chasing Spat around sometimes, but she is very patient with him. When he does bad things, she tells him to 'just do good things'. She always says "tee hee" at the end of her sentences.