He makes a single appearance in Squigly's Story Mode after Black Dahlia slaughters his family and his wife Selene becomes the Skullgirl, telling Leviathan to keep everyone away from Squigly, even him. In Squigly's Skullgirls Mobile origin story, he takes a more active role, acting as a right-hand man to Selene as she goes on her mission to take down the Medicis as part of her undead army.
In the picture to the right, he has a bloody hole in his arm where Leviathan once was and a trail of
blood leading from him. Since he was Leviathan's previous host, that the host dies when the parasite disconnects, and Leviathan keeps Squigly "alive", Roberto sacrificed himself to bring Squigly back to life.
He most likely died of blood loss from Leviathan leaving him as he does not appear to have any wounds sustained from Black Dahlia's attack.
- Since Leviathan is passed down through the Contiello family, Roberto is the heir by blood while Selene married in.