Quinn Fabray could be involved too. Given her history of being concerned about her looks and status, a weight gain story for her could be about her learning to love herself regardless of the number on the scale. It could also involve her relationship with the other Glee club members as they support her through the process.
Well, obviously Tails is the main character as it's about his weight gain. But Sonic often shows up in these fanfictions too. Sonic might be there to support Tails, or he could be initially confused about what's happening to his friend. Another character could be Dr. Eggman. He might be the cause of Tails' weight gain, either intentionally through some evil plan or accidentally because one of his inventions backfires.
Twilight Sparkle is often involved. As a central character in the My Little Pony universe, her studious and sometimes self - conscious nature can be interesting to explore in the context of weight gain. Pinkie Pie could also be a main character as her love for parties and food might lead to some scenarios of weight gain. And Rainbow Dash, with her athletic build, could have an interesting character arc if she were to experience weight gain, perhaps struggling with her identity as an athlete.
His Pokémon are central, as they are always by his side. Pikachu would be a key figure in any story related to Ash. Then there are his human friends. Brock could be involved in cooking for Ash, which might contribute to the weight gain. Misty could be there to comment on Ash's appearance and give her opinions. And in some fanfictions, Nurse Joy or Professor Oak might also be included to provide medical or wise advice regarding Ash's situation.
Obviously, Quinn is a main character as she is the one who is pregnant. Finn might also be heavily involved as he was Quinn's boyfriend in the show and could play different roles in the fanfiction, like being a supportive partner or facing difficulties in dealing with the pregnancy.
Finn is often a main character in such fanfictions. Since he is the protagonist in the original 'Adventure Time', it's natural for writers to explore different scenarios involving him, like unexpected weight gain and how he copes with it.
Kurt Hummel could be another. He is known for breaking gender norms in the show. A male pregnancy plot for him could be a way to further explore his character's journey and how he navigates such an extraordinary situation, as well as how his friends and family react.
In some glee weight gain fanfiction, a character might gain weight because of a medical condition. This could lead to a journey of self - discovery and the support of their friends in Glee club, who help them through the tough times. The story could focus on how their relationships change and grow as a result.
Alina is also frequently involved. Her connection to the Darkling in the original work makes her a natural addition in many fanfictions. Their complex relationship can be further explored or even rewritten in different ways in fanfiction.
Her Pokemon are very likely to be involved. For example, Piplup might be very concerned about Dawn's weight gain and try to cheer her up or help her in some way. Her friends like Ash and Brock could also be in the story. Ash might be a bit clueless at first but then show his support, while Brock could offer some advice on healthy eating or dealing with the physical changes.
Tyrion Lannister could be involved. He's a clever character who might offer his unique perspective on Daenerys' weight gain. He could use his wits to help her navigate the political fallout if there is any. Jorah Mormont is another one. He's deeply loyal to Daenerys, and his reaction to her weight gain could be interesting. He might be protective or concerned in a different way than others. Varys too. He's always scheming and would see how he could use this new development to his advantage in the power games.