When I first created Jidos, I only had plans to make him some brooding cis white pretty boy. Like he had no development. He was just quiet and intimidating. And he'd just end up falling in love with Tracour because "yay yaoi." He had no motivations of his own. He just followed Tracour. Zero character development.
Now Jidos is trans, not white, missing an arm and an eye, is a doting older sibling, and can be pretty snarky. There's a lot more to him than that but he's definitely become more of a character than he used to be.
I feel kinda bad that I didn't give Zhagiel and Lyxia as much thought as I did Tracour and Jidos but honestly the story does mostly revolve around those two... Lyxia babysits them most of the time though because otherwise they'd jump into things without thinking. silly boys. use your head every once in a while.