|
Before the events of Undertale, Asriel discovered the first human to fall into the Underground. They became siblings and close friends. Before the human died, their final wish was to see the golden flowers from their home village on the Surface. Asriel absorbed their SOUL, and together they carried the human's body across the barrier. After their SOULs merged, they shared control over Asriel's body.
The villagers assumed the fused being had killed the human child. It did not fight back and fled instead. Mortally wounded, it returned to the Underground and died. Asriel's body turned to dust, which scattered across the garden in New Home.
Later, during the determination experiments, Alphys injected determination into one of the golden flowers that had bloomed in that garden. The experiment initially failed, and she returned the flower to Asgore. Not long after being replanted, Asriel awoke as Flowey.
Though Flowey had the will to live, he felt nothing toward his parents or anyone else. Without a SOUL, he could not feel love, joy, or compassion. He reset countless times, experiencing everything the world had to offer, until he eventually met the human protagonist.
Flowey introduces the bullet board mechanic and refers to his attacks as "friendliness pellets." If the protagonist dodges three times, he becomes frustrated and tells them to run into the bullets. If they comply, he explains his worldview. Regardless of their choice, he tries to kill them with an unavoidable ring of bullets, but Toriel intervenes and saves them.
If Flowey was killed on a previous Neutral Route, he does not appear again until New Home. If spared, he reappears at the start of the Ruins and gives advice. If the protagonist resets before completing a Neutral Route, he repeats his tutorial. Resetting again makes him annoyed. If a Genocide Route is reset after leaving the Ruins, Flowey says he will be waiting.
At the Ruins exit, Flowey judges the protagonist's actions. He does not do this if he was killed previously or if the Genocide Route was aborted. After the Ruins, he is mostly absent but can be seen burrowing into the ground in certain rooms. He also leaves a message on an Echo Flower in Waterfall that changes depending on whether Toriel was spared or killed.
If the protagonist kills Asgore, Flowey appears and destroys his SOUL. If Asgore is spared, Flowey kills him himself. In either case, he absorbs the six human SOULs and transforms into Flowey X. The game crashes, and the battle begins upon reopening.
After defeating him, the protagonist can choose to spare or kill Flowey. Sparing him requires multiple mercy actions before he flees. If spared, he gives advice on subsequent Neutral Routes. If killed, he does not appear in the post credits message. Resetting after killing him causes him to reappear at the end of Asgore's battle, berating the protagonist for thinking killing him solved anything. If the Genocide Route is aborted, Flowey becomes upset but says the protagonist will eventually return to their malicious ways.
During the True Pacifist Route, the protagonist finds tapes in the True Lab that reveal Chara and Asriel planned to reach the Surface and collect six human SOULs. On Chara's deathbed, Asriel admitted he no longer liked the plan, leading to his betrayal and the plan's failure.
After restoring the elevator's power, the protagonist receives a phone call from an unfamiliar voice, which sounds similar to Asriel's.
| 
"Spoilers Ahead"
