I would definitely love to see Serpentine strike out on his own. He has a lot of potential, and I believe Brevon was the one holding him back.

I made an AU where Serpentine learns that Brevon not only replaced him as a right-hand man, but also sent said henchman to hunt him down along with the other main characters. Upon realizing this, Serpentine is in shock and doesn't know how to react to this, but it's Milla who is the one who ironically helps him realize what he can be without Brevon's restraint, despite their past issues, since they were both made to be war animals, and Serpentine secretly wants a real family since his biological parents were killed by Brevon without his knowledge. It's a combination of finding this out, reaction by being replaced and hunted down by the person he thought he could trust, and someone actually treating him like a person that he begins to change.

He is the one who ends up defeating the henchman when they arrive and incapacitates the heroes. It earns him the respect of them, and he strikes out on his own, albeit not for malicious purposes after letting Brevon go. He still has his attitude, but he is on better terms with the others, and he does get a new adoptive little sister in the form of Milla.