A couple more quotes "Chara seems to be in control of the protagonist's scripted sequences, as the sequences in the Genocide Route differ from the Neutral and True Pacifist Routes. Instead of following commands of other NPCs, the protagonist defies them as Chara seems to become corrupt while the route progresses. The first example of defiance occurs when the protagonist ignores Sans's request to hide behind the conveniently shaped lamp; the last is when the protagonist kills Flowey after the player presses Z or Enter on their keyboard before Chara makes their appearance." - undertale wiki's chara page.
If the protagonist chooses to "ERASE," Chara calls the protagonist "a great partner." Additionally, their eyes widen, and Chara says to the protagonist that they will be "together forever."
If the protagonist chooses "DO NOT," Chara seems confused, they then seem to shake it off and Chara's eyes widen, saying the protagonist was never in control. Afterward, a jump scare occurs, in which Chara approaches the screen with twisted laughter. The screen (or game window) shakes while a loud droning sound loops in the background - also undertale wiki's chara page
Listen I don't want to argue just read this paragraph from the undertale wiki. "While initially cast in a sympathetic light, Asriel admits at the end of the True Pacifist Route that Chara "...wasn't really the greatest person." Asriel states that Chara climbed Mount Ebott for an unhappy reason, and adds that Chara "hated humanity".
At the end of the Genocide Route, Chara behaves in a polite, deliberate manner, thanking the protagonist for guiding them, and teaching them that power was the reason they awoke. They tell them that their determination woke them from death when entering the Underground. However, if the protagonist refuses to destroy the world, Chara becomes frustrated and confused, wonders what the player wants instead, and then finally gives in to the frustration, erasing the world anyway." -undertale wiki's Chara page
Yeah that's perty bad and I know you said you agree but I just think I should point out that Asriel turns into a flower with no soul (literally) that wants to kill his family and friends. Sorry if I sounded rude