The main characters are Rook and Ben's babies. Rook, who might be from a different background or with different abilities, is the one who is going to interact with the babies. The babies, on the other hand, could have inherited some of Ben's traits. Their interactions will form the core of the story. For instance, if Ben has superpowers and the babies show some signs of those powers, Rook will have to deal with that while getting to know them.
It could be about Rook having some sort of adventure while meeting Ben's babies. Maybe he helps protect them from a threat or teaches them some unique skills.
Obviously, Ben Tennyson is one of the main characters. He is the central figure around whom the story revolves. And the 'babies' are also main characters, though who they are exactly can vary. They could be new alien forms that Ben discovers and takes under his wing, or they could be some sort of younger versions of himself or other characters related to the Ben 10 universe.
Obviously, the Big Chill babies would be the main characters. There might also be some other characters from the Ben 10 universe like Gwen or Grandpa Max who could play supporting roles.
One possible plot could be that Rook and Ben go on an adventure to a new planet in the Ben 10 Omniverse. They encounter a strange alien species that has a unique power. Ben tries to use his Omnitrix to transform into an appropriate alien to deal with the situation, but there are some glitches. Rook, with his Plumber skills, helps Ben figure out what's wrong and together they overcome the challenges and make new friends among the aliens.
Yes, there are likely quite a bit. Fanfiction communities are vast and diverse. For a pairing like Ben and Rook, fans who are interested in their relationship often write stories exploring different aspects of it, from adventures they go on together to more emotional and personal interactions.
By having them face a common enemy. When they fight side by side against a powerful foe, they can learn to trust each other more and understand each other's fighting styles better.
Obviously, Link and Ben Drowned are the main characters. Link is the heroic character from the Zelda series, known for his bravery and combat skills. Ben Drowned is a creepy and often malevolent character.
The main characters would be Wes and his babies for sure. But depending on the plot, there could be teachers or mentors from the local music scene. These characters could play important roles in the development of the babies' musical skills. For example, a strict but kind music teacher who helps the babies perfect their vocal techniques or learn new instruments.
The main characters are usually Itachi and Sakura, as the 'itasaku' in the name implies. And of course, their babies are central to the story as well.
Rook's character could develop by becoming more in touch with his emotions. Usually, he is very by - the - book as a Plumber. But being around Rayona, he might start to take more risks and think outside the box. For Rayona, she could become more confident in her abilities. Maybe she starts off a bit unsure, but as she goes on adventures with Rook, she realizes her full potential.