Hi everyone, here I will explain how the two shinobi's power works!
Sakura Haruno:
Every time she uses her kekke genkai, her hair will change into a blood red colour and her eyes will also have a darker green colour. Though with the sharingan it would be impossible to see the eye change. She also can still use her super strength as a combo to her attacks. She will later in the story take the past shinobis power to the next level, well except for the First and Second Hokage since I don't know how further I should take it.
Hidan Haruno:
Before I start explaining his power, all of you should know that from now on I will and you will address Hidan as a Haruno too. Now back to my story, when Hidan use his kekke genkai, all of you had found out that his eyes glows, and the same goes for when he summons weapons, animals, etc, their eyes or blades will also glow purple, even if it's a shadow or not, plus it will come alive.
So yeah that's all there's to be explaining. Enjoy the rest of the story!