A lesson in why not to give the best powers to the most technically redundant characters.

From the start Orihime is 100% autistic; she's ridiculously book smart but has strange fascinations and hobbies, this makes her quite an endearing character and I kinda understand why she lacks agency and appears somewhat helpless in a number of situations, speaking from experience, Autism doesn't give you much in the way of social skills or being able to read situations very well, so I'm not as harsh on her as say Leena Toros or Fuko Kirisawa.
But unfortunately despite having a power that if used correctly could easily have made the series more streamlined, Orihime is probably the worst choice for it.
Shun Shun Rikka has the power to reject phenomena by denying or undoing events in various forms, this power can be used for attack, defense, or healing, it's effectiveness is tied to Orihime's emotions, getting stronger through determination and weakening through doubt.
Going over what I just said about Orihime, she's the worst choice for an ability that relies on emotions to control it's power output, this inevitable made her a damsel in distress when she could've quite easily avoided it.