Ben 10: Carnitrix Without Downsides?

Short synopsis: Transmigrated into Ben 10, Zack gains the Carnitrix and a system—no side effects, pure power, and terrifying Alien forms!

Synopsis-

After transmigrating into the Ben 10 universe as Gwen’s adoptive cousin, Zack had one simple goal — enjoy the story from the sidelines.

But when Ben finds the Omnitrix… Zack finds something else.

He gets a System.

And that System gives him the Carnitrix — a powerful, unstable device that normally turns its users into evil monsters with no control.

Except Zack’s version? He just transforms into the evil versions of Ben's aliens but with—No side effects. No loss of control. No death!

Fight to evolve. Change the plot. Unlock new aliens.

And when he finally gets Alien X?

"I can use Alien X without arguing with the other two personalities? Hahaha! Fck yes!"*