Since it's a Glee fanfiction, it would likely include characters like Rachel Berry. She's often torn between her big dreams (her head) and her feelings for her friends and Finn (her heart).
Probably Kurt Hummel as well. He has his own ambitions in the fashion and performing arts world, which is his head leading him. But his heart is also involved in his relationships with his friends in the Glee club, like Blaine. His story could be explored in terms of the head - heart dynamic.
There could be a fanfiction storyline where a Glee member is in a love triangle. Their head tells them one person is a more stable and practical choice, like someone with similar career goals. But their heart is drawn to another, who is more of a free spirit. This internal conflict could create a lot of drama and character development.
Finn Hudson could also be a main focus. His leadership in the Glee club and his relationships, especially his romantic ones, can be developed in interesting ways. For instance, a fanfiction could show how he listens to his heart when it comes to choosing between his love for music and his love for a certain person.
There might also be characters that are minor in the original but become more prominent in the fanfiction. They could be given more complex personalities and important roles in the 'gloaming glee' story.
Typically, the substitute teacher would be one of the main characters. They are likely to be the central figure around which the story revolves. And then, some of the students from the 'Glee' club would also be main characters. For example, characters like Rachel, Finn, or Kurt who are very prominent in the original 'Glee' series. Their interactions with the substitute would form the core of the story.
It could be some of the well - known characters from 'The Empire' who take on new roles in the context of the Glee club. Maybe Lucious Lyon could be one, bringing his strong - willed and often controlling personality into the club and causing some chaos.
The main characters are Finn and Rachel. Finn is often portrayed as a bit of a jock with a big heart, and Rachel is the extremely ambitious and talented singer. In the context of the pregnancy fanfiction, they are the couple facing the life - changing event of having a baby.
Mr. Schuester from Glee could be a main character too. He could be the one who tries to bring the two groups together, seeing the potential in the Glee club and Supergirl working as a team. His role as a mentor in Glee could be extended to Supergirl as she tries to navigate the more complex aspects of human relationships and teamwork in this crossover fanfiction.
I don't know for sure as I haven't read it. But it could be the main characters from 'glee' like Rachel, Finn, Kurt, or Santana. Maybe it focuses on one of them in a'stuck' situation.
The children of Rachel and Finn could be main characters. Maybe their son or daughter inherits Rachel's amazing singing talent and Finn's charm. They could struggle with living up to their parents' legacy in the glee club.
Finn Hudson could also be a main character. He could be the one who has some initial reservations about the whole royal welcome thing but then slowly gets into the spirit of it as he sees how much it means to the other members of the Glee club.