User blog comment:Teengohanrocks/Most evil Complete Monsters/@comment-2175012-20171114213245

With Ego, once again, the tier system. Ego is as heinous as he possibly can be as far as a Celestial is concerned. His plan would've ensured the destruction of all life, but what makes him particularly stand out is his murders of his own biological children when they didn't develop the Celestial gene.

Hela would probably be below Ego in that regard. The Asgardains are noted as not actually be gods in the MCU, but advanced aliens. With that being said, she still has a massive bodycount, her rule over Asgard is simply horrific, and there's the fact that she's been doing this type of thing for years. That's not even getting into trying to kill her own family. She would roughly be around the tier that Ronan the Accuser is in as they both commit mass murders, albeit for different reasons.

Thanos...we'll have to wait and see about.