Howdy! I'm Faxy! Faxy The Rose! -Faxy introducing himself.Faxy is a rose, and the GoldenTale replacement of Flowey.
Faxy is a rose that is possessed by the dust of Faxriel's ashes/dust and a shot of DETERMINATION. Now, he is back and corrupt.
Not much is known about Faxy, until the player does the True Pacifist route. There, it is shown that he is a DETERMINATION experiment gone wrong.