If you're looking for manga similar to Hanako@Lavatory, you might like these titles.
Our MC is attacked by a ghost while sitting at his computer. The story does not follow normal convention however: she (the ghost) doesn't kill him instead teases him with his computer, mostly because she is stuck in the wall and can only reach his computer. For comedy...
This is the story of Ichiro, whose life is changed forever when he discovers a procession of ghosts walking down the street and with a local reporter tries to figure out why the ghosts are walking through town.
Yuuko is a ghost and is super bored. She just wants someone to see her. And there's a high school boy who can... only he pretends not to. The more he acts like he has no idea, the more her obnoxious attempts to talk with him escalate...
Rena Haze may be surrounded by spirits, but she feels as lonely as ever—that is, until her ever-growing spirit line catches the attention of Mitama, a wimpy spirit buster who swears to protect her no matter what. Rena may find Mitama and his unorthodox exorcism methods annoying, but there's something about him that keeps her coming back for more. The quest to free Rena of her spirit line starts now!
Extreme movie-lover Hajime Shinichi and the ghost of the mysterious genius screenwriter Takihiko Tenmaku--their meeting will provide some serious plot twists! It's ready, set, action for this coming-of-age series!