http://breezewiki.catsarchywsyuss6jdxlypsw5dc7owd5u5tr6bujxb7o6xw2hipqehyd.onion/undertale/wiki/Sans
There are a multitude of interpretations for this as it does not give a clear answer. [ 49 ] However, in the official Japanese translation released in 2017, Papyrus refers to Sans as "Nii-chan", a somewhat immature way of addressing one's older brother. In Legends of Localization Book 3: UNDERTALE , it's stated that during the translation of Undertale to Japanese, rather than make a blind guess, the translator consulted with Toby for details.