I don't think it's a straightforward true story. Usually, such shows take liberties and combine various elements to make it more captivating. Maybe there are loose connections to reality, but it's not a pure retelling of actual events.
The top 15 creepypasta stories feature a variety of terrifying tales. For instance, 'Sonic. exe' which takes the innocent Sonic the Hedgehog character and twists it into a demonic, blood - thirsty entity. Then there's 'Zalgo', an ancient and powerful being representing chaos and evil. 'Ticci - Toby' is about a boy with a mental disorder who becomes a serial killer with an affinity for axes.