Banshees are female spirits in Irish and Scottish folklore who are known for bizarre screams and are known to appear at people's houses when a member of a family will die. At least one Banshee appeared in both The Real Ghostbusters and Extreme Ghostbusters.
In The Real GhostbustersEdit
In Extreme GhostbustersEdit
There is a Banshee whose sister is a siren. Banshee used her sister to feed on people's youth, but the two of them were trapped by the Ghostbusters. Because of the family connection they share, it can be concluded that sirens are also a type of banshee. They first appeared in the episode Sonic Youth and made an appearance inside the Containment Unit in the episode Slimer's Sacrifice.