The upcoming animated series Undervale could be a natural competitor in the adult animation space against shows like Hazbin Hotel and Rick & Morty. The world of adult animation has been impressive in recent years, expanding in surprising ways. Animated shows on streaming services like Netflix, Prime Video, and Max have each released their own takes on the genre, with a number of shows that utilize the relative creative freedom of streaming to push the envelope in terms of scope, story, and style.

https://screenrant.com/undervale-rick-morty-hazbin-hotel-showdown/