As the title says, i had left my laptop on hibernate during the night and when i opened it back up the next morning, my wallpaper suddenly changed into a picture of an anime character? There was even a shortcut to the characters Wikipedia and the picture that was used for the wallpaper on my home screen. Am i being hacked? I live with nobody that would pull this type of prank on me. Nobody touched my laptop since last night, what is happening???
Sounds like a rat on your system, malwarebytes and scan it.
You could find in the registry the hkeys for run, hkey (forget which) current Microsoft Windows run (certain it’s that) and it’ll show things set to run with boot, check for something suspicious on that too.