Goowee

Goowee is an alien parasite which morphs to anything. He appeared in Ben 10 Vs Capcom 2. He's like Mechu except smarter.

Origins
Aliens in their dying planet sent a puddle around space to land on a planet capable of life which is Earth. The puddle was told to cover the whole Earth so that all of the aliens from the dying planet would survive the apocalypse. Instead the puddle betrayed those aliens and started walks to it's path. Silver wings found this puddle and the puddle had to host of one of his agents. Silver Wings named the alien Goowee.