Chara

Chara is a character in Undertale.

Biography
Not much is known about Chara. The most confirmed in Undertale is that they fell underground and were adopted by the Dreemurrs. In a plan to break the barrier, Chara died and gave their soul to Asriel to break the barrier. Chara hated humanity and wanted Asriel to kill six more humans to destroy the barrier, but he didn't and died as well.

It's heavily implied that Chara is the narrator in Undertale, describing all the enemies as a spirit watching over Frisk.

Headcanons
While it is a common belief that Chara is responsible for the Genocide Route, since nothing has ever been confirmed, it is assumed they are not responsible. Another headcanon is that Chara is a female, but of course, nothing is confirmed in Undertale.

Alternate AUs
Storyshift Chara (Chara in the role of Sans) has been mentioned numerous times.

Glitchtale Chara has also been mentioned, but indirectly. It should be noted that this Chara is canonically a he.

Trivia

 * Chiaki Sakura Rose might have a small crush on Chara, as described in a Discord message. The message goes over Chara's presence on her Twitter, such as Chara being her CuriousCat header when that was used, and the frequent Tweets about Chara.
 * Sakura has stated to like Papyrus more but it's unknown how much this holds true.
 * It's also unknown how this affects Weiss.
 * Storyshift Chara was a considered character for King for a Crazy Day, but Betty was picked over her.