OCs in fanfiction are basically characters made up by the writer themselves. They can be used to give the story a unique flavor, create new relationships, or take the plot in unexpected directions. It's a way for the author to put their own creative stamp on the fanfic.
Well, without actually reading the specific fanfiction, it's hard to say exactly who the main OCs are. But generally, in a fanfiction related to 'The Pacifier', the main OCs could be new kids added to the family Wolfe is babysitting. They might have distinct personalities, like one could be a shy introvert, another an overly energetic extrovert.
First, think about their personalities and backgrounds. Make them unique and relatable. Then, come up with an interesting plot that challenges them and shows their growth.
Another well - liked OC is Max. He's a bit of a rebel on the ice. He has his own unique way of playing hockey that challenges the traditional Mighty Ducks style, which makes for some interesting storylines. He's also very loyal to his friends on the team.
Many male OCs are also shown to befriend the main Naruto characters. They might start as rivals but then develop a deep friendship. This helps them be integrated into the existing Naruto storyline and also allows for some interesting interactions and story developments.