One popular one is 'Ranma 1/2'. In it, the main character Ranma transforms from a boy to a girl when splashed with cold water.
Well, usually they focus on the physical and psychological changes of the character. The art style might be very detailed to show the transformation process.
In the manga, the transformation of the girl into a boy is often accompanied by emotional and social challenges. The author might use detailed illustrations and dialogues to show the inner struggle and adaptation of the character.
It usually happens through magical or fantastical means. Maybe a spell or a special power causes the change.
One reason could be that it plays with the idea of unexpected pairings. People are drawn to seeing how these two very different characters interact and possibly develop a relationship against all odds. Also, it gives a fresh perspective on social hierarchies in a school setting.
Once upon a time, there was a boy named Tom. One day, he found a magical mirror. When he looked into it, he started to transform. His hair grew long and silky, his features became more delicate, and his body took on a more feminine shape. Soon, he was a girl. She named herself Lily and started a new life full of different experiences.
Once upon a time, there was a boy named Tom. One day, he found a magical potion in an old attic. Out of curiosity, he drank it. Slowly, his features started to change. His voice became softer, his hair grew longer and his body took on a more feminine shape. He was shocked at first but then decided to embrace this new identity. He learned how to dress like a girl, walk gracefully and even changed his name to Tina. Eventually, he became a confident girl and made many new friends who accepted him for who he was.
Once there was a boy named Tom. He was always interested in the things that girls usually like. One day, he decided to transform his appearance. He started by growing his hair long. Then he learned how to do makeup from his female friends. He also changed his wardrobe to more feminine clothes. Gradually, he felt more confident in his new look as a girl.
A boy named David had a passion for dancing. In the dance world, he was often inspired by the grace of female dancers. He started to take steps towards becoming a girl. He first started with voice training to make his voice more feminine. Then he began hormone therapy under proper medical supervision. His transformation was a long journey, but in the end, he became a beautiful girl named Daisy and was able to fully express himself through dance.
It usually does it through a series of events and character growth. Maybe a magical spell or a scientific experiment causes the change.
It shows the transformation in a detailed and gradual way. The story and art work together to make it quite vivid.