One idea could be that the OC is a new baby spy who comes in and challenges Boss Baby's authority in the baby corp. Maybe the OC has some unique skills like being able to communicate with animals, which helps in their missions.
One idea could be a crossover with 'Toy Story'. The Boss Baby could end up in the world of toys and have to deal with Woody and Buzz. Maybe he tries to take over the toy hierarchy, thinking he can run things better. Another could be a crossover with 'The Incredibles'. The Boss Baby might try to recruit the Incredibles for some top - secret baby - related mission. He could use their superpowers to achieve his goals.
One idea could be to explore the Boss Baby's adventures in a different city. Maybe he gets sent on a secret mission to Paris and has to deal with French baby competitors. Another could be a time - travel story where the Boss Baby goes back to the era when his parents were kids and tries to change something in their past that would affect his present situation.
One idea could be that Boss Baby and Stacy team up to solve a mystery in the corporate world of baby products. Maybe there's a new formula that's making babies act strangely and they have to find out who's behind it.
One idea could be that the Boss Baby has to deal with a new rival baby from a different company who has even more advanced baby gadgets. Another could be that he goes on a mission to a place where all the babies in the world get their 'business' training and discovers a big secret there. Or perhaps he has to team up with some regular kids to solve a problem that affects both the baby and kid worlds.
One idea could be an OC who is a half - demon, half - angel trying to find their place in the Helluva Boss universe. They could have unique powers that come from both sides of their heritage and face discrimination from both demons and angels.
A plot could revolve around a project at work. The boss and the employee are put on a high - stakes project together. They face many challenges and have to rely on each other. In the process, they start to understand each other's work styles better. The employee might have a creative solution to a problem that impresses the boss, and the boss's experience guides them through difficult decisions. This shared experience could lead to a deeper connection between them.
One idea could be that baby Mario and baby Luigi get lost in a magical forest filled with strange creatures. They have to use their baby wits and little jumps to get through obstacles and find their way back home. Maybe they befriend a little fairy who guides them part of the way.
One idea could be that Baby Mario and Baby Peach go on a magical adventure through the Mushroom Kingdom, encountering new and strange creatures along the way. They might have to work together to solve puzzles to reach a special power - up that can save the kingdom from a new threat.
One idea could be a story where the baby in the 'baby project' has some sort of special power that the characters have to figure out how to manage. Maybe the baby can communicate telepathically and it leads to all sorts of comical and heartwarming situations as the characters try to understand what the baby wants.
One plot idea could be that Baby 5 and Sai are on a mission together. They start off not getting along well because of their different personalities. Baby 5 is impulsive and Sai is more reserved. But as the mission progresses, they begin to understand each other's strengths and develop a mutual respect. They end up saving each other during a dangerous encounter and form a strong friendship.