I'm writing this YA Fantasy novel and I've already summarized the whole story and ending, but I really want to add more characters to it. I Have two main characters dealing with two main events in the story, and both of the characters have friends/companions. None of them need another friend to join their group, but I want to add an extra character. I want to add one because so far there are only a few characters in my fantasy world (only 6)!
The first main character is a young witch trying to find the hidden Island that the villain has been trapped in for centuries, "to fulfill the prophecy," with help from a young talented wizard like her.
The second main character is also a witch trying to gather the army of the two kingdoms to fight against the third kingdom, accompanied by a poet, a warrior-princess, and her brother.
I can't add more characters to these groups, maybe a side character or an anti-hero will help?
What do you think?
What should I do?