Hina is Haruhi's cousin on Haruhi's mom side, she has long dark hair and looks vaguely like Haruhi. She goes to Ouran in search of her cousin and what she finds is... interesting to say the least. Hina is pretty normal, like Haruhi, and she is very smart, just like Haruhi. The only difference (other than appearance) is that Hina is a year older. She is in Kyoya's and Tamaki's class and has everyone in the host club drawn to her because of her unique personality. As events unfold, we see the true Hina, not the brave girl who would do anything for her dearest cousin. Hina calls herself selfish, but it was just one of her promises that she made, and she intends to keep it.

Sonoda Eri is an artistic 17 year old girl that soon attends the prestigious school, Ouran Academy. She gets lost on her first day there though, but soon after finds a third music room.