The Contiellos are a famous line of opera singers and long-time clients of the Medici family. Nothing much is really known about them outside of their connection with the Medici family however more may be revealed as the series goes on.
The majority of the Contiello family is only shown in a flashback during Squigly's story mode during Selene's birthday party. However, Black Dahlia and a group of Medici assassins arrive and kill all of them after being informed by Double that the Contiellos possessed the Skullheart. After Selene wishes her family back from the dead, they become undead servants of the Skullgirl, sans Squigly.
- It is unknown how long ago or under what circumstances Leviathan began serving the Contiellos. Considering how negatively parasites are viewed, it is surprising that a prestigious family would openly have one.