Ditto

Ditto (voiced by Rob Paulsen in a voice resembling that of Yakko from Animaniacs) is a Splixson (based on the word "split") from the Earth-like Planet Hathor (the first syllable of this name being similar to the word "half").

Ben first transforms into Ditto in Divided We Stand.

Abilities
Ditto is a small, humanoid alien with the ability to clone himself without limit. Every clone operates independently, regardless of whether or not Ben wants them to, and each clone is indistinguishable from the others. Though the clones are autonomous, they share each other's pain, and the death of one clone will cause the death of the rest (as seen with Dr. Animo's Ditto-enhanced Stinkfly mutants) which negates the usefulness of making large numbers of clones. The child-size Ditto is also no stronger not faster than his size and build suggests.

Weakness
If one of the clones were to get injured the rest would get injured aswell.

If all Dittos aren't together Ben can't change back.

Planet
The planet Hathor is home to a race called Splixsons who have grown out of Mitosis (that is how they can divide without limit), but they don't fight or start wars at all(that was made clear in Divided We Stand) becasue of this they are more peaceful than other races and they tend to be farmers or painters because of it.

Ultimate Alien
Ditto will reappear in Ben 10: Ultimate Alien.His symbol now on his chest.The Green Round parts on his body are now yellow.