Characters
Deltarune features 3 playable characters who take up the role of the Lightners aka the heroes of the story.
Deltarune is not a sequel to Undertale, nor does it take place or affect the world of Undertale, according to developer Toby Fox. However, some characters will look and behave similarly to those who appeared in Undertale. This had led to plenty of theories claiming this game could be a prequel or an alternate universe to Undertale.
Characters
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In addition to these characters, there's also several Enemies and a dense population of Townspeople featuring plenty of nods to Undertale.