There is an anime series with something similar to this as one of the premises, 'Overlord'. Near the beginning, the protagonist uses superuser powers to reprogr

There is an anime series with something similar to this as one of the premises, 'Overlord'. Near the beginning, the protagonist uses superuser powers to reprogram a cute but hateful character in a VR game so they are in love with him. It goes rather less well than he expects. Great series, incidentally.