Mary Honeynozuka is Honey's sister. They are fraternal twins, Honey being older. They are both 3rd years at Ouran Academy. After Mary comes back from her training trip, she comes to live with Honey. Honey and Mary are almost the same. They both look like 5-6 year olds, both like to eat sweets, both have a stuffed bunny from their grandma and both of them are martial arts champions. The only difference is that they are opposite genders.