Based on the name "Waifumiia," it appears you are looking for Mia, who is widely known across the internet by her slightly varied handles waifuumiia or miawaiifuxo. She is a massively popular American digital creator, TikTok star, and cosplayer. She built a massive following—amassing over 3 million followers on her main TikTok account—through her engaging gaming content, e-girl aesthetic, and highly popular cosplays of characters from franchises like Spider-Man and Star Wars.