Board Thread:Questions and Answers/@comment-39792218-20191016201653/@comment-26907577-20191125180914

...for whose name? Question answered.
 * Flowey: Himself
 * Toriel: Herself
 * Literally every random encounter: Flavor text
 * Sans: Himself
 * Papyrus: Himself
 * Monster Kid: Flavor text
 * Undyne: Herself
 * Alphys: Mettaton
 * Mettaton: Flavor text
 * Asgore: Every major character
 * Asriel: Flavor text
 * Frisk: Asriel repeats it back
 * Gaster: Everybody who talks about him (not many people) does so by name.
 * Chara: True Lab tapes; Flowey; Asriel; themselves.
 * "Chara", as opposed to "Tim," "Jesse," or whatever you name them: Naming flavortext displays "The true name".