Esther Anderson

Colleague/estranged mother/daughter/sister of the protagonist (depending on what cheats are or aren't used). Can also be a catgirl, cowgirl, pirate or a combination of the three depending on what cheats are activated.

Spoiler

If she is Minorou's sister, she's a virgin because she never had a boyfriend before and was too shy for having a conversation with a member of the opposite sex.