These are the nicknames these girls give you and you give them. These are all feminine leaning so sorry if your a guy.
Chiaki
Yours: Peach, Princess Peach, Pikachu, Mystic.Hers: Gamer girl, Aki, Sweetie.
Ibuki
Yours: Doll, Gorgeous, Honey buns.Hers: Rocker Chick, Candy stripe, Neon rave.
Mikan
Yours: beloved, darling, goddess, queen, perfectHers: recovery girl, sweetie, baby
Hiyoko
Yours: darling, babyHers: Princes, beautiful
Sonia
Hers: Princess, majesty, goldieYours: Baby, sweet cheeks
Peko
Hers: sword girl, ko, YakaYours: Honey, my one and only, lovely