Chara

Chara is implied to be mischievous, and can make a "creepy face" with a certain smile.[4] Chara is also intelligent, secretive, and persuasive. Chara does not let their plan be recorded on the camera,[5] and they gain Asriel's trust to continue their plan.[6] At one point, Asgore noticed Chara once had a sense of hope in their eyes.[7] Despite this, much of Chara’s personality and intent is ambiguous. There is evidence to suggest that some narration, as well as descriptions of certain actions and events, is by Chara themself. However, the narrator throughout the entirety of Undertale is up to speculation. At the end of the Genocide Route, Chara behaves in a polite, formal, and terse manner. Chara's vocabulary is slightly above average, and they are blunt and criticizing in their dialogue.[8] After a second Genocide Route, Chara expresses confusion at the protagonist's "sentimentality," and states that they can no longer understand such emotions, implying that they, like Flowey, have lacked a SOUL, and thus compassion, since their death.