Eeidos is a dick because he is bitter about being orphaned, about his own choices to wander for a total of two years, about being hunted by bounty hunters and not only that, but it's just part of his personality. And by violent, I meant if there's a decision to be made between being passive or aggressive, he going to lean toward being violent and aggressive. Should've been more descriptive. And I'm using "impossible" in a hyperbolic way. If he needs to be the villian, I have no problem but I'd prefer to go with what I originally wanted to go with, to accompany Saekaera.

EDIT: The monks teach monk stuff, but the mental part of it deteriorated as Eeidos grew up and became two other teachers' student.
EDIT #three hunnuh: He's not dead because he's good at killing people. He's "Extremely skilled at offensive fire bending"