God of the worst part of the underworld. You know, the bit that punished people forever.
In some versions of the myth he was not only the horrible chasm in the Underworld that housed all the Titans as well as the poor fools who were damned for eternal suffering… but he was ALSO the primordial Greek God responsible for creating the Typhon, a powerful beast created for Zeus to kill (I mean… to kill Zeus…). Yes, he also did the sex with Gaia in order to create it. So, you know, more of the brotherly, sisterly love that was completely normal and not weird at all. Sarcasm. Lots of it.