According to information from the Undertale Wiki and statements made by Toby Fox, the creator of Undertale, Sans is depicted as the older brother of Papyrus. The evidence supporting this claim can be found in a tweet from Toby Fox, where he mentioned that Papyrus would call Sans “aniki,” a term commonly used in the Japanese language to refer to an older brother.
It’s worth noting that the official information regarding Sans and Papyrus’s relationship is limited, and Toby Fox prefers to leave some aspects of the game open to interpretation. However, the use of “aniki” by Papyrus strongly suggests that Sans holds the role of the older brother.
This information is consistent with the dynamics between Sans and Papyrus in the game. Sans is portrayed as a more laid-back and relaxed character, often acting as a source of guidance and support for Papyrus. Papyrus, on the other hand, is ambitious and determined, always striving to become a member of the Royal Guard. Their interactions and dialogue throughout the game further emphasize Sans’s role as the older sibling, offering advice and teasing Papyrus in a familiar manner.
It is important to note that Undertale is a game that encourages player exploration and interpretation, and there may be different perspectives on the relationship between Sans and Papyrus. Some fans have speculated about alternative theories or headcanons, but based on the available information, it is generally accepted that Sans is the older brother.
According to the Undertale Wiki and statements made by Toby Fox, the creator of Undertale, Sans is considered the older brother of Papyrus. The use of the term “aniki” by Papyrus and the dynamics between the characters in the game support this claim. However, it is important to acknowledge that Undertale allows for different interpretations, and some fans may have alternative theories or headcanons regarding the relationship between Sans and Papyrus.