Originally Posted by
Lyth
Tangents aside, I think that Erenville and Cahciua's interactions were some of the best written segments of the Dawntrail MSQ. It actually feels like they're a family of real people. I know there are some localisation nuances around how Erenville's reactions are expressed that could influence whether you interpret his banter as 'irritation' as opposed to 'familiarity' in various languages, but it's pretty obvious that he was close to his mother, even despite his introversion. His growing anxiety was palpable as he questions the locals in S9 about her. It's not at all surprising that after losing her he wants to find a way to carry on her memory and legacy.
I think OP's points are correct. Characters need time to grow organically through their interactions with others. This also gives the writers the opportunity to gauge the audience's reactions to them and capitalise on aspects of those interactions that people find enjoyable.
Hyth is another example of a character who started out with a bit part, that expanded out through the Tales from the Shadows short stories, and eventually lead into his own starring role. Each progressive appearance fleshed him out more, to the point where the character almost writes himself. I think when you try to force this to happen artificially, then you start to run into problems.