[quote=@Garden Gnome]
Do you guys think Gravikinesis would be too over-powered to consider?
[/quote]

No more than telekinesis, telepathy, shape-shifting, density control, the ability to fire optic blasts etc. Every power has the oppurtunity to be exploited into being overpowered. The key is the limitations and drawbacks you, as the player, place upon your character.