Nick Fury should be in it. As the head of SHIELD, he would have an interest in Skye. He could be the one who discovers the truth about Skye being Coulson and May's daughter and then try to use her for his own purposes. This would put Coulson and May in a difficult position of having to protect Skye from Fury while also trying to figure out how to be a family.
There's a fanfic called 'Coulson and Skye: Partners in the Shadows'. This one delves deep into their characters. It shows how they support each other during difficult missions. The author does an amazing job of portraying their unique bond.
One idea could be that Coulson and May had a secret relationship in the past and Skye was the result. They hid her away to protect her from the dangerous world they were in. As Skye grew up, she started to show signs of extraordinary abilities, which led to her being discovered by SHIELD. Coulson and May then had to face their past and decide how to be part of Skye's life while still protecting her.
One common theme is friendship. Since Coulson and Skye are part of the same team, many fanfics explore how their friendship grows and deepens over time. They support each other through tough situations and share a bond that is unique within the team.
Character development is key. The fanfic should explore their individual personalities and how they grow together. Maybe Skye becomes more confident under Coulson's guidance, and Coulson learns to be more open - minded because of Skye. Also, an engaging plot that involves both of them is important. It could be a mission that only they can complete together due to their unique skills and relationship.
One great Coulson - Skye fanfic is 'The Bond Between Them'. It beautifully explores their relationship within the framework of the story's universe. It delves deep into how they support each other during difficult missions and how their friendship evolves over time.
Goten would be a great addition. He could add some light - hearted moments and also show the family dynamic between him, Gohan and Chichi. His innocent and sometimes mischievous nature would contrast well with Gohan's more serious side.
Snowball is a great character to include. He adds an extra layer of conflict as he also has his own ambitions for world domination. Another good one could be the lab scientists. Their presence can add some mystery and backstory to Pinky and the Brain's situation. And Elmyra, she can bring chaos as she always does in the original show, disrupting Pinky and the Brain's carefully laid plans.
Annabeth could be a great addition. She could bring her strategic mind to help Percy deal with Medusa. For instance, she might come up with a plan to use Medusa's own pride against her.
Fluttershy could also be included. Imagine a scenario where Trixie is trying to put on a big, bold magic show and Fluttershy's timidness contrasts with that. Twilight might be caught in the middle, trying to make sure Fluttershy doesn't get too scared and that Trixie doesn't feel like her show is being ruined.
Korsak is an excellent character to include. His experience and loyalty to the team can contribute to the story. He can be a source of wisdom and support for Rizzoli and Isles during cases. Another good character could be Angela Rizzoli. Her motherly nature and her insights into Jane's life can create interesting sub - plots.