Shape shifting, totally. Even with the arbitrary limit on body mass it's still an awesome power. I've wanted to be something besides this shape for a loooooong time now. On the other hand, teleportation is the real super power, more than shape shifting. I'd just want other people teleporting themselves around, wouldn't need it myself. I'd probably study how their power worked though, and rig up a machine that would teleport things around. The existence of teleportation would mean that the universe is not closed, has curl, and pretty much that one can violate the laws of thermodynamics and get a free lunch.
*changes into a ferret floating in a 198kg bucket of water, climbs out of the water and runs around nipping at people's toes*
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looking for my box
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