How much each character needs to be explored

Whether it’s backstory or just straight character development (it’s more of the former), I would like to see a chapter dedicated to that character (or maybe a mini series/short film if they have the budget??)

Credit to https://myanimelist.net/manga/178671/My_Bias_Gets_on_the_Last_Train/character https://www.personality-database.com/profile/1881189/yoon-ina-my-bias-ge for the images.