The Gaster card is not included in the official Undertale tarot, which indicates that this card is either a spoiler or not canon. However, Toby Fox has stated the merchandise is not canon.

Is Gaster evil in Undertale?

Evil: Gaster is a dark, and cruel entity scattered across space and time. Like most Underfell characters, he has darker and more evil personality than his Undertale counterpart. Gaster was also the previous royal scientist, before Alphys took his place after the 'incident'.

Is Sans Gaster a father?

Gaster is not father to Sans | Fandom. Here's some facts that may prove that Gaster is not the Father of Sans and Papyrus. Remember: This is just a theory, you choose what you think. ... The shopkeeper tells you that Sans and Papyrus "...