reincarnator, and with both of them not facing hardships but instead trying to blindly focus on the future they want (and end up changing with their actions), they really didn't need to develop personality wise, even more with people not defying them harshly or having either suffer from unexpected consequences (Heronia never having a real comeuppance where she was left without anyone to turn to for reassurance before the graduation, and Bertia always expecting the worst to come to her, so no matter if stuff went bad with the prince or not, she'd wouldn't take it as a sign she should change)