If there was to be a theoretical 3rd parallel game alongside Undertale and Deltarune, what do you think it'd focus on?

Undertale focuses on the nature of Monsters

Deltarune focuses on the concept of Darkness and the Delta Rune

Personally, I think it'd focus on Humans next. The plot could maybe have something to do with lucid dreaming and sleep paralysis? Although this concept might be too similar to OMORI probably.... 🤔

The Earthbound and Mother 3 influences would be really apparent here lol