|Non-Canon: Characters and/or events depicted in this article are non-canon to the main continuity.|
Plen Stroff is a Splixson who only appeared in the comic Ben 10: Omniverse Parallel Paradox. He is a trainee recruit Plumber, and is a part of a squad alongside Ilma with Cooper Daniels as his training officer.
Plen is about the height of an average human child. He has white skin, a black and white head, white face, along with black shoulders. Plen's hands are large with 4 digits and his feet are merely stubs. He has three fin-like growths on his head.
Overall, he looks similar to the original series design of Ditto.
- Ben Tennyson treats Plen as a friend, and is surprised to see him again in Parallel Paradox.
- Plen does not demonstrate any of his powers as a Splixson.