Glitchtale Chara

Chara is the first human to have fallen into the Underground, becoming the adoptive son of the rulers Asgore Dreemurr and Toriel, as well as the adoptive brother and best friend of Asriel Dreemurr. As time went on, Chara and Asriel had a strong bond, being the best of brothers and friends towards each other. Wanting to free monsters from the Underground, Chara and Asriel conducted a plan, where Chara poisoned himself with buttercups, eventually dying of terminal illness, allowing Asriel to absorb Chara's SOUL in order to cross the Barrier. In his home village, Chara took control over Asriel and attempted to kill the humans there to obtain their SOULs in order to destroy the Barrier, but Asriel resisted and went back to New Home, allowing himself to get attacked by the villagers. When Asriel died of his wounds, Chara remained as a ghost who haunted the Underground for ages.

When Frisk fell into the Underground, Chara became his partner, watching Frisk make friends with the enemies he faced and eventually fighting Omega Flowey, a monstrous form of Asriel. Chara had observed Frisk using SAVE and his Determination to keep coming back to life after dying, and later on, in the True Pacifist Route, Frisk and Chara fought Asriel in his godly form. The two managed to save Asriel from his despair, bringing up his emotions with memories of his childhood with Chara. Afterwards, Asriel used his powers to break the Barrier, freeing all the monsters so that they could live happily on the Surface. However, Frisk had been resetting the timeline over and over again to relive the True Pacifist Route, and later he pushed the forces of space-time to its limits, going through dangerous routes after every reset, much to the chagrin of Chara. During the Genocide Route, HATE manifested inside Frisk's SOUL, and while it was corrupting the two humans, Chara was feeding off its energy to gain strength and reincarnate.

In his final battle with Sans, Frisk was about to reset and make up for his mistakes, but Chara took over and tried to kill Sans, but Frisk managed to sacrifice his life to save Sans, giving him his human SOUL. Powered up, Sans eliminated Chara before resetting, however, since he reseted at a moment he was not suppose to, this created glitches across space and time. When Frisk was about to activate Hard Mode, he infused the unbearable HATE into Chara, unintentionally corrupting him fully and brainwashing him into a psychopathic megalomaniac who was sent to the Void. One of the glitches allowed Chara to return to his home dimension, leading him to absorbing Determination and trying to extract Determination from Frisk. During the Battle at the True Lab, Chara fought against Sans and Flowey, winning the fight by obtaining Frisk's Determination, taking control over the timeline.

However, after freeing W. D. Gaster, the heroes fought against Chara once again, but his Determination was too strong, so Flowey was empowered by the SOULs of Frisk and the six fallen children, transforming Flowey into Asriel the God of Hyperdeath. While the siblings were inside a bubble of HATE, Chara explained how he had been corrupted before engaging in a fight. During it, Asriel, Frisk and the spirits fought against HATE and reminded Chara of all the fun memories he had with Asriel, freeing Chara from HATE. As the siblings reunited, Chara used the remains of his SOUL and the SOUL Traits from the other children to create a rainbow SOUL for Asriel so that he could live on as his normal self, while Chara would pass away. Chara emotionally bade farewell to his best friend before he was transported to the Void.

A month later, Frisk and his friends were faced against Bête Noire, so Frisk traveled to the Void, where he reunited with Chara. He was told by Frisk that Chara would obtain Frisk's SOUL so that they could supposedly switch places, with Chara being alive. However, Chara learned that Frisk was planning to replace himself with Chara, which would erase Frisk and everyone's memories of Frisk from existence, much to Chara's utter dismay. Chara returned to the timeline and he had his battle against a HATE-infused Asriel, holding onto Asriel's Heart Locket to make Asriel believe that was Chara's. He lured HATE from Asriel into himself, freeing his brother, while Chara maintained his normal mindset using hope. After Bête Noire was killed, HATE began attacking Determino, prompting a fierce final battle against the malevolent creature, and with the help of Asriel being the God of Hyperdeath, Chara slayed HATE, saving the world. Growing up, Chara continued being the best of friends with Asriel

When Frisk met Chara in the void, he punched him in the face and for throwing his HATE on him as he stated. He blamed him for what happened in Season 1 until Frisk said that he could no longer reset and asked him to take his place as the game's main protagonist.Chara asks him why, and Frisk shows him his hand. It was glitching badly to Chara's surprise. Frisk also notes that they are the one Asriel Dreemurr will listen to, considering how Chara was Asriel's best friend.

Frisk switches places with Chara, removing Frisk from the timeline and forgotten.Chara begs Frisk to stop and says that he doesn't want to forget him, crying. Frisk saves his changes, and Chara returns to life.