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Flowey usually appears as a sentient, grinning, golden flower, with a white androecium, six yellow petals, and a light-green stem. Flowey can contort his face into at least 45 different expression. and mimic the faces and voices of other characters. He mimics Toriel and Asgore in some situations, as well as his old self at the end of the Genocide Route. He also mimics JK face before the Neutral Route's final battle.
Initially, Flowey operates under a façade of friendliness and politeness. He often greets JK with southern slang, such as "Howdy!", calls himself "your best friend," and, like his father, appends polite words such as "gosh" and "golly" to the ends of his sentences. Whenever he drops this guise of friendliness, he often calls him an "idiot."
Flowey has a malevolent and cruel disposition, berating JK for not following his "kill or be killed" philosophy.. He is manipulative, devious, and a cunning planner and subtle if the circumstances require it. He retains his memories between SAVEs because he was once able to SAVE. He is also shown to be extremely cowardly, as he kills his former father to appease him in a vain attempt to save his own life from Geno-JK.
Flowey introduces the concept of the bullet board and calls his bullets "friendliness pellets."
JK fails to dodge his bullets, he announces his central philosophy, he then attempts to kill him with an unavoidable ring of bullets, but Toriel intervenes and saves him.
At the exit to the Ruins, Flowey judges JK actions up to that point.
As a flower, Flowey uses only three attacks: a five-bullet spread that slightly hone in on the protagonist's SOUL, a large ring of bullets which surround the SOUL and cannot be dodged and a vertical row of bullets which come from the side of the Bullet Board, from outside it, which also can't be dodged. This attack is only used before his battle as Asriel Dreemurr. He can speed up the spread though the limits of his attacks and speed are unknown. Getting hit by his five-bullet spread in his first encounter deals 19 damage per bullet whereas the unavoidable ring attack heals 19 HP regardless of whether it hits the protagonist. Before his battle as Asriel Dreemurr, the bullets deal 7 damage until 6 HP where it is 5.
- Flowey and Mettaton represent the two characters with voice clips; Flowey says "Hmm, that's a wonderful idea!" at the end of the Ruins on a Genocide Route.