Anyone who's seen any of my battle threads knows that I like illustrations so please post the picture of your character.
Barry Allen as the Flash... no ifs, ands or buts... HE IS!
I say this because BARRY IS THE SOURCE AND THE CREATOR OF THE MOTHERFUCKING SPEED FORCE! Wally may be able to tap into the speed force but Barry IS that power... so no matter what universe he's put in, he would still have his superpowers regardless where the Speed force is in that universe.
ALSO HE'S OUTRAN MOTHERFUCKING DEATH!... DO I honestly need to say any more then that?
God (what with being fast enough to simultaneously be everywhere at once for all of eternity, including before the origin of all reality/realities and after the end of the universe/multiverse). That is, if you're an atheist or agnostic (which I'm not)- but any fictional comic-book equivalents to 'God' would work as well, I suppose.