Poof is Timmy Turner's (and ezekiel's) god brother. He was born when Timmy wished him up to fill the void of having a brother after his brother Ezekiel permanently left him and knew his bro wouldn't be the same again. Cosmo gave really painful birth to him. Many confuse Poof has female due to his purple colors and big eyelashes.
In Fairly Odd Baby, Timmy, Wanda, and Cosmo were protecting their newborn from being gang raped by Jorgan von "Jughead" Strangler, Anti-Cosmo, Head pixie, and even Cosmo's own mother. Poof eventually stopped being the target of rape ever since the movie ended.