|Appeared in|| Toushin Toshi 2, Galzoo Island, Rance IV, Kaeru nyo Panyon|
|Cameoed in||Rance IX}}|
The Lady Killer is a very strange looking Guy Monster, resembling a cute little baby with wings and underwear in his head.
However, his adorable looks are only in appearance, since his true nature is that of a hedonistic brutal killer. He wields a bloody knife with a sadistic, yet innocent looking(?) smile. Women are his natural enemy, who are his priority targets, and the reason of his name. In many appearances, Lady Killers have the special property that they cannot be harmed by women.
The Lady Killer is actually an endangered species, due to the trouble he faces for breeding with Gal Monsters.
A Lady Killer in Rance IV has set up a clever trap: it hides past a door warded against men, meaning only women can enter, where they will discover they cannot harm him. Maria Custard and her party trick the Lady Killer into leaving its bunker, at which point it is killed by Rick Addison.
Lady Killers play an important narrative role in Kaeru nyo Panyo~n. In the game's introduction, they are found attacking the female cast, who cannot harm the monsters due to the Lady Killer's special ability. Poron Chao arrives on the scene, newly transformed into a harmless Panyon, and nearly sacrifices himself trying to save everyone. This selflessness endears Poron to the ladies, who join him on his quest. No Lady Killers are seen for the rest of the game, which is best, as the party would be just as incapable of stopping them.