Which Character you Think Needed more Spotlight?

That is my Question

Which characters in the Series you think needed more Spotlight weather Demon Slayer or Demon? And what do you think they could Done bit with said character or characters and what other Epic things you wanted them to do even by Flashback or something like that

Person I like to see more of Tanjiro and Nezuko I know they were the main characters but I like to see there life before events of the main story probably leading to events of the opening events of the main story

I also like to see more of Tengen Uzui and his 3 wives and going from Ninja to Hashira

Please put Spoiler Bars on any Manga Spoilers

So Characters do you think needed more Spotlight?

Art by Koyoharu Gotouge