Obviously, the girl is the main character.
The girl is most likely to be the main character. In a story like this, she would be the one through whose eyes we see this ticklish heaven. She might be a normal girl from our world who gets transported to this special place. Her reactions, her exploration, and her growth within the story would be the focus. So, it's almost certain that she is the main character in the 'girl in ticklish heaven story'.
Maybe it's about a girl who discovers a place full of ticklish experiences. She might encounter various things that make her giggle uncontrollably.
Imagine a barefoot girl, Sophia, in a meadow. She was lying down, looking at the clouds. A butterfly landed on her bare foot. Its wings fluttering against her skin tickled her. Sophia couldn't help but laugh. She was so gentle not to scare the butterfly away while still enjoying the ticklish feeling. It was a beautiful and ticklish encounter.
It could be that she has some personal insecurities related to being ticklish. Perhaps she has been teased in the past because of her ticklishness, and now she doesn't want to admit it. Also, she might be trying to keep a certain image, like being tough or unflappable, and admitting to being ticklish would go against that image.
In a magical forest, there was a ticklish girl named Ella. She was on an adventure to find a hidden treasure. Along the way, she met some friendly fairies. The fairies, not knowing she was ticklish, flitted around her and their tiny wings tickled her neck. Ella burst into laughter, which made the fairies laugh too. They then became friends and together they found the treasure, all while sharing lots of laughter.
She could either end up laughing so hard that she falls down. For example, if she's being tickled by a playful pet, she might lose her balance and end up sitting on the floor still giggling.
A barefoot girl, Emma, lived in a seaside town. She was the most ticklish person around. One sunny day at the beach, her siblings decided to have some fun. They tickled her feet with a seagull feather they found. Emma shrieked with laughter and squirmed in the sand. Her desperate ticklishness made it a hilarious sight. Even the passers - by couldn't help but smile at the scene of her trying to fend off her siblings' playful tickles.
One reason could be that her feet are more sensitive because she is often barefoot. The soles of the feet have a lot of nerve endings, and without the protection of shoes, they might become more sensitive over time. So, even a light touch can make her desperately ticklish.
It could be an ordinary girl named Lily. She is just a normal school - going girl until the shrinking incident happens to her.
The main character is, of course, the girl. She could be a young student who is on her way back from school when the rain starts.
Maybe it's an orphan girl, like Emma, who has always felt different and then finds out she has wings which are the key to her true identity. She might be from a lost race of winged people. The story could be about her journey to find her people and her place in the world.