Suggestions for this?

[Rotem]

[Apeiro]

Either a new spell or, as you suggested in another topic, a super-speed potion.
Or maybe add that to brooms so they'd have something more than just avoiding obstacles and catching snitches.

[Pie]

We just need the Flash costume to go along with the super speed potion and everything is all set! XD

[Skystone]

Looks sick! I wanna use that for dueling!

I agree with Apeiro, either a new spell or potion.