Who could be the main characters in a 'beach surprise' fanfic?

The main characters could be a group of adventure - seeking teenagers. They are always looking for new thrills at the beach, like cliff diving or trying out new water sports. Their day at the beach would be filled with adrenaline - pumping activities.

Well, it could be about a group of friends who plan a secret beach party for one of their friends. They decorate the beach with fairy lights and balloons while another friend lures the birthday person there. When the 'surprisee' arrives, everyone jumps out and they have a great time with music, food and games on the beach.

It could be an experienced trainer who has a team of fully - evolved Pokemon. This trainer might be taking a break from their usual battles and just wants to relax at the beach with their Pokemon pals. Maybe they have a Charizard that enjoys sunbathing on the warm sand.

It could be a rogue medical ninja who was once a colleague of Shizune but turned to the dark side. This antagonist might be jealous of Shizune's position in the village and her relationship with Tsunade. He or she could try to undermine Shizune's new discovery or training program in the fanfic by causing chaos in the village and framing her for it.

A new character could be the main one. Maybe a girl from a fishing district who has excellent swimming and diving skills. She could be a tough competitor, knowing how to navigate the beach and the sea better than others. Or it could be a boy who was exiled to the beach before the Games started and has learned all the secrets of the beach, like where the fresh water sources are and the safest places to hide from other tributes.

The main characters are obviously Zim and Gaz. Zim is an Irken alien who is on a mission to conquer Earth, although he is often hilariously inept at it. Gaz is a moody and somewhat antisocial human girl who loves video games and is often annoyed by her brother Dib's antics. In a beach - centered fanfic, their personalities would interact in interesting ways against the backdrop of the beach environment.

Most likely Naruto will be the central character. Alongside him, we can expect to see his usual companions. Sakura could be there, perhaps providing some medical support or getting involved in a beach - related mystery. Sasuke might be there too, either as a friend or with some ulterior motives. And Kakashi could be there to guide the young ninjas, especially if there are any dangerous situations or training opportunities on the beach.

I'm not entirely sure without more context, but typically there would be a group of survivors.

Since I'm not familiar with the specific 'the christmas surprise story', the main characters could be a family, like a mother, father, and their children. Maybe there's also a kind - hearted neighbor.

Since I don't know the details of the 'big surprise story', I can't say for sure who the main characters are.