The Ghost Girl
The ghost girl is a minor character in School Rumble. Not much is known about her. She appears on the second OVA and the last episode of the school rumble anime, episode 26 of season 2. While in the manga, it's volume 2, bonus chapter 4, 'Haunted'.
She appears whenever Yakumo has love trouble or some really deep problems, her appearance is similar to that of Yakumo herself, implying possible relation to the Tsukamotos. She will ask questions about love like " why are you sacrificing yourself to make a person happy?" or "Do you hate or love a person you know?" she can notice if a person is lying or not.