It could be many characters. Maybe it was Videl. In the Dragon Ball series, Videl is a strong - willed girl, and she has a connection with Gohan. So in the fanfiction, it might be her that Gohan thought was cute.
If Gohan was a girl, the dynamics within the Dragon Ball universe would shift. Her relationships with other characters might be altered, and her power development could take a unique path.
Character relationships are a big theme as well. There could be stories about Gohan forming friendships with the Young Justice members, or even romances. Some fanfictions might explore how Gohan's different values from the Dragon Ball world influence the more morally - complex Young Justice universe.
One common theme is growth. Both Gohan and Videl are often shown growing as individuals, whether it's in their martial arts skills or in their personal relationships. For example, Gohan might become more confident in his fighting abilities, and Videl might become more understanding of Gohan's Saiyan heritage.
One key element is the power dynamic. Gohan is extremely powerful, so seeing how that power compares and contrasts with the abilities of the Young Justice characters is important. For example, his Super Saiyan forms are much more powerful than most of their powers.
I'm not sure specifically as there could be many interpretations. It might be a fan - created story about a girl and Gohan in relation to a red machine. Maybe it's a story where the girl has some sort of encounter or adventure with Gohan that involves this red machine.
Sadly, I have no idea which author wrote the 'girl in the red machine gohan fanfiction'. Fanfiction is often created by many different people all over the world, and this one could be by an amateur or someone who just wanted to explore this particular scenario with Gohan and the girl and the red machine.
Perhaps there's a powerful artifact that Gohan touches, and it transforms him into a girl as a form of curse. In this new form, Gohan starts to notice different things about himself and the world around him. He might have to learn new ways to fight and move, as his body is now different. His relationships with his friends like Videl and Piccolo could also change, as they try to help him adapt and find a way to break the curse.
Obviously, Gohan as a girl would be the main character. His family members like Goku, Chi - Chi, and Goten would likely be in the story. They would have different reactions and interactions with Gohan in his new form.
Well, it could be about Gohan's daily life experiences as a girl. Maybe he has to deal with different social situations, like how his friends and family react to his new form.