I can't believe I'm about to ask this but how would you fix Hinata's character?
For me Hinatas character is a simple fix
1: give her motivations beyond Naruto and her love for him
2: Have her accomplish something beyond just being background or a plot device
3: at the end have her let go of naruto and move on from a childish love. have her ackowledge Narutos feelings for Sakura and in the context of her own feelings move forward
the first is the biggest as it stands now the character is utterly irrelevant to the story. there isnt a single moment you have her in that she couldnt be replaced by another character to the same or greater emotional effect.
Give her plot points that represent who she is as a character beyond her crush and that let her stand on her own mertis without naruto
*Lead her clan into the future
*surpass Hanabi as heir and in skill
*find her fathers approval
*Live up to nejis legacy and sacrafice if such occurred
these all give her motivation beyond Naruto and let her stand on her own as a character
the 2nd is in reference to her many moments basically accounting to nothing. Such as her moment in the Itachi hunt where she sees kabuto had orochimarus DNA in him, this couldve been a big sequence of events where she and naruto spoke to each other and she could confirm her feelins or let Naruto confirm feelings for her OR Sakura either way but instead shes there soley to confirm with her magic eyes that Kabuto is different something any generic Hyuga couldve done with the same ability
shes essentially useless in the moment
same with her confession or the proud lose speech both pivotal moments of growth for naruto but both inevitable ending in being nothing more then minor footnote moments for her as again she could be replaced with another character to the same or greater emotional effect
Lee or Iruka or Sakura couldve delivered the proud loser speech
Sakura or Iruka couldve confessed feelings towards him as love or familial bonds before Pein harmed them to even greater emotional effect at the time
make hinatas moments meaningful make them moments of character growth or development by following them up with conversation or a brief moment of introspection'
3: As in my head Canon and the Canon of the In your storylines Hinata must let go and move on, theres a dojin of this very subject i cant remember its name though but in the end one panel stood out it was Hinata walking away from naruto and Sakura while her yoingerself runs towards them. this image always stuck with me and i adopted it as the image of my own story
Hinata in the end confessing to naruto but admitting shes lost to Sakura before walking away from her crush on naruto is the pinnacle of growth for her letting go of the obsessive love and growing up. We dont always get our crush in the end we have to be adults and live our lives while hoping the one we love does well and is happy. She does this lets her younger self run off but she moves on
Let Hinata grow up let her become a young lady instead of a little girl hiding behing a telephone pole all the time.
long story short theres multiple easy steps to fix Hinatas character that dont involve assassinating others in the process and leave her with viable plot elements and potential for future story elements all while wrapping her story up neatly