A child, even a teenaged one, can be difficult to pinpoint on the Enneagram scale, partly because they are physically undeveloped. What does this character tell us?
He’s a rebel. He doesn’t function well in foster care.
Regardless of that, he cares deeply about people in his life, including the foster parents. He wants no harm to come to them.
He wants no harm to come to anyone. He stops the Terminator from killing random strangers. John’s ethic of life is very strong, even though he can’t fully explain why.
He rescues his mom, even though logic says this is a dangerous choice.
This deeply ingrained sense of right and wrong, and the determination to follow it no matter what, says Six. If you think of John Connor, leader of humanity’s survival, in the future, Six-ness suits him. The level of belief, conviction, and authority a Six carries are what people will need when life hangs by a thread.
Also, the Six paranoia is probably what will lead him to keep dogs as cyborg sniffers.