Olga Vieira is a Brazilian YouTuber known for her content focused on true crime, serial killers, etc. She has gained a significant following due to her in-depth explorations of these dark and often chilling topics. Vieira is easily recognizable by her distinctive red hair and her tattoos, which have become part of her personal brand and are often featured in her videos. Her content style is engaging and informative, drawing viewers in with her unique perspective and detailed analyses of various crime cases.