Need Help Characterizing Former Child Soldiers Turned Villains

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I don't know where the other thread went, so I'm reposting it here.

For my "Cyberpunk D&D game" (do not tell me about Shadowrun, I already know), the main series of villains are the cybernetic soliders called the Vulcan Hunters, which sounds fairly routine, until you realize that ritual to create one requires the future Vulcan has to be at least 5th level in an adventuring the age of 15 or below.

Basically, each and every one is a former child soldier.

So, how do I characterize this particular aspect of theirs? I already have their individual personalities down pat, I just want to know your suggestions for giving an aspect that reflects their shared history.