It could be Rachel. She's very ambitious and often steps on toes to get what she wants. So a story where she does something that she's afraid others will hold against her, like stealing a solo opportunity from someone else, would be interesting.
Another possible plotline could be a new member joining the Glee club who has a bit of a dark past. They're worried that the others will find out and hold it against them. So the story could be about their journey of trying to fit in while hiding this secret, and how eventually they either have to come clean or their secret gets revealed in a very unexpected way, causing a stir in the whole Glee club.
Maybe she's a very private character. For instance, if Sakura values her privacy a great deal in the original story, fans might feel restricted in writing fanfiction about her personal life or thoughts. So, she 'holds back' the fanfiction in that sense.
She might be interested because it offers a different perspective on human creativity. Glee is all about music, performance, and the power of the underdog, and fanfiction adds another layer of creativity to it. Supergirl, being an alien trying to understand humans, could find it fascinating to see how people imagine crossovers between her world and the world of Glee.
In a glee fanfiction where kids take charge of the glee club, there could be a lot of creative changes. They might introduce more modern and youthful song choices. For example, instead of the usual classic show tunes, they could bring in the latest pop hits that resonate with their generation. This would likely attract a different audience to their performances, perhaps more of their peers from school.
The use of 'Take Me or Leave Me' in Glee fanfiction might also be related to character development. It could be a turning point for a character who has been too submissive before. By embracing the message of the song, they start to assert themselves more, both in the Glee club and in their personal lives.
Some of the glee club members would be really excited. For example, Tina might be all smiles and offer to help with baby - sitting in the future. Finn could be a bit more awkward but still happy for them. Quinn, having her own experience with pregnancy, would give Emma some practical advice.
In a Glee and Avengers crossover, there could be a plot where the villains from the Avengers' world target the Glee club because they see their unity and positive energy as a threat. The Avengers would have to protect them. Finn could be inspired by Captain America's leadership and try to step up as a leader in the Glee club. And the Avengers might be entertained by the Glee club's musical numbers during their down time.
If Glee watched Flash fanfiction, it could be a very interesting cross - over in their mind. Maybe they would start to imagine their own musical versions of Flash's adventures. They could see the Flash's fast - paced action and translate it into energetic dance moves and catchy tunes. However, it could also just be really confusing for them as the two worlds are so distinct.
At first, Flash might be a bit confused. His world is so different from the world of Glee. But as he listens more, he'd start to appreciate the artistry. The emotions expressed through the music would touch him. He might even start to see parallels between the unity and teamwork in the Glee club and the teamwork he has with his own allies in fighting crime. He could then become a big supporter of the Glee club, using his powers to spread the word about their amazing music.