The Rapunzel story can be made scary in some versions. In a dark take, the witch who locked Rapunzel in the tower could be truly evil. She might have used Rapunzel's long hair not just for access but for some dark magic rituals. Rapunzel, all alone in that tall, dark tower, would be terrified of the witch's every move, never knowing when she might be used for something more sinister.
The isolation of Rapunzel is also very scary. She is alone in that tower with no one to really talk to or rely on. She has no idea what's going on in the outside world. It's like being in a prison cell but much worse because there's no end in sight to her loneliness.
The unknown nature of the threats around the tower is also quite scary. It could be supernatural forces, like ghosts or demons. There's no clear understanding of what might be lurking in the shadows outside the tower or what might be waiting for her at the top of her hair when something climbs up.
There was a scary take on Rapunzel's tale. The witch who kept Rapunzel was actually a powerful necromancer. She used Rapunzel's long hair to perform dark magic rituals. One day, Rapunzel noticed that the hair she cut off was used to create undead creatures. These creatures started to climb the tower using her hair. Rapunzel was horrified. She had to find a way to stop the necromancer and destroy the undead. She managed to set her hair on fire, burning the creatures as they climbed, and then faced the witch in a final showdown.
Rapunzel in the real story is very brave. Despite being locked in a tower for years, she didn't lose hope and was able to face the challenges when the prince came and when the witch found out about their relationship.
Rapunzel is definitely not true. It belongs to the realm of fantasy and folklore. Tales like Rapunzel are often used to spark the imagination of children and adults alike, but they have no basis in reality.