"Are you sure you want to do that?"
– Flowey when he interrupts Max's fight
Flowey looks exactly like his UnderTale counterpart, but his personality is much different.
When he flower-ified, he managed to keep calm, and not succumb to temptations.
Flowey uses Friendliness Pellets as his main form of attack, saying that "Friendliness Pellets are kind of, uh, [his] thing."
He seems to have some connection with Weenie.