It could be that fictional characters have qualities and stories that resonate with you on a deep level. Their adventures and emotions can make you feel connected and invested. Also, they often represent ideals or fantasies that you find appealing.
Maybe it's because they offer an escape from reality and bring joy and excitement into your life.
You might be attached to fictional characters because they provide a form of companionship or inspiration. Their stories can be comforting and give you a sense of belonging, even if they aren't real.