Board Thread:Questions and Answers/@comment-28898329-20160901162911/@comment-26432906-20170101184447

There is one piece of evidence that goes against the NarraChara theory. The only time Chara speaks in canon is at the end of the genocide route. As you can see in this post,

http://nochocolate.tumblr.com/post/155085840489/charas-speech

there are certain quirks to their speech pattern that don't align with the narration, such as the avoidance of contractions. (The narration does use contractions). As a supporter of the NarraChara theory, I headcanon that this is because the narration is transmitted through thoughts sent to the player/Frisk, not speech said to the player/Frisk. However, that is a headcanon. This is the one weak spot in the NarraChara theory. Hope this helps.