Are fictions that plaster idols with a false personality easy?

I'm doing a story like that and it is not easy! I'm just confused by the popularity of them.

Stories that make this adorable little thing into a playboy jerk or whatever the popular personality is.....

Well I personality believe Yongguk is hiding a y side so those stories I'm okay with

Well Zelo is introverted so to write a fan fic about him you might have to change a bit about him........he is a teenager so I accept stories about him in the erted manner but only to an extent

Young Jae is type AB so pull back the reins and he might a calmer version of Heechul, I only make the assumption since Heechul is type AB as well

To be honest Jong Up is really 4D so I really don't fully grasp his personality....He's a different brand of 4D than me and most Jong Up stories don't really catch my eye

Himchan stands out as motherly and peacekeeper.....I see most if not a lot of people using this personality.....unless I missed the other stuff

Okay so is it really easy just plaster the idol with a different personality? I'm only asking cause if it is then I wanna start doing that! And I would have something to do for an up and coming Daehyun fic....Speaking of that I have a slight idea but I wondered if peoples want to experince Jong Up or Zelo battling Daehyun for the girl or is their some random group I you persons want to challenge Daehyun for the girl?