I don't think the mc's personality is going to improve anytime soon, rather, it might even get worse when he bonds with his commanders and learns to love demons, the story will turn into a comedy romance slice of life and the author will make spin-offs where they are in modern japan as cooks, students, etc
...anyways, im dropping now
(I might return in the future when im bored and there are more chapter so that I can see whether the mc's personality has improved or not)