Deltarune is a role-playing puzzle game developed by Toby, and many people also consider it to be a sequel to Undertale. So, does the Sans battle in Deltarune exist? To clearly understand this question, we first need to know who he is. This article brings you a detailed guide and explanation. Those who like this cute skeleton character might as well come and learn about it.

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Sans is a minor NPC in Deltarune, appearing as a returning character from Undertale. His existence is not a key figure in the main storyline but serves as an easter egg and a link to the world connection. Therefore, there is no "Sans Battle" in Deltarune (the judgment battle is exclusive content of Undertale).
Although similar to the setting of Sans in Undertale, Deltarune is an independent parallel universe, and the character backgrounds and storylines are not directly related (for example, the game does not mention the "Judgment Hall" or "Timeline" related plots).

II. Character Appearance and Personality
Appearance:
Completely consistent with Undertale: small skeleton body, iconic grin, hollow eye sockets.
Wears a blue hoodie, black shorts with white stripes, and slippers, maintaining a lazy style.
Personality:
Lazy and humorous: likes to make jokes and tease others (such as giving Kris a fake phone number).
Values family: often mentions caring for his brother Papyrus's happiness (although Papyrus does not officially appear).
Friendly but distant: shows kindness to Kris and Toriel but deliberately keeps a distance (such as refusing to form deep friendships).
III. Appearances and Interactions in the Story
Chapter One
First Encounter:
After returning from the Card Kingdom, Kris can find Sans's grocery store on the edge of the town (modeled after Grillby's bar in Undertale).
Sans claims to have "just moved to the town" and invites Kris to visit his brother (hinting at Papyrus) another day.
Phone Number Easter Egg:
If the "friend" option is chosen in the conversation, Sans will give a "phone number," but dialing it actually connects to the "Idiot Baby Hotline."

When asked to be friends again, Sans explicitly refuses to be associated with an "idiot baby," showcasing his prankster nature.
Chapter Two
Grocery Store Plot:
Toriel buys eggs from Sans, and their interaction is interspersed with jokes (such as Toriel teasing Sans's cold jokes).
Asgore suddenly appears, interrupting the conversation, hinting at a potential love triangle (Toriel, Asgore, Sans).
Brother-Related Dialogue:
If Kris did not talk to Sans in Chapter One, he will be surprised that Kris knows he has a brother and jokingly denies it.
Clearly states that "things are unresolved," preventing Kris from meeting Papyrus (setting up for future chapters).
Interaction with Susie:
Susie is annoyed by Sans's cold jokes, highlighting the conflict in their personalities.
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IV. Player Community Speculations
Hidden Clues About Papyrus:
The sound of "bones rubbing" coming from behind Sans's house suggests that Papyrus may exist in subsequent chapters of Deltarune.

Some data mining shows the existence of "Papyrus voice files," but they have not been implemented yet.
Potential Connection to Gaster:
Sans's line "things are unresolved" may point to his connection with Gaster (the hidden scientist in Undertale).
The background music in the grocery store contains a variation of Gaster's theme, reinforcing the theory of the parallel universe.
In summary, Sans in Deltarune serves as a "nostalgic easter egg" and a "narrative smoke screen." His presence both satisfies the expectations of series fans and maintains the independence of the parallel universe through vague handling. To experience the complete story, one needs to pay attention to further revelations of his background in subsequent chapters.