Skywarp

Teleportation is a dangerous tool in the hands of a capable adversary. Thankfully for the Autobots, Skywarp is the only Decepticon who possesses that ability. Skywarp's not so bright, so without supervision he's worthless as a warrior. He mostly uses his teleportation power for immature pranks on both friend and foe. He takes a charmingly puerile angle at thuggery, so his pranks are well-received amongst his Decepticon peers (excepting the victim, of course).

Because, come on, a surprise push down a staircase is hilarious.

Sometimes he is known as Hellwarp.

(Source: www.tfwiki.net)