A sidekick character is a supporting role often seen in movies, books, and TV shows. They are usually loyal companions to the main character, offering support, advice, and occasional comic relief. Some synonyms for a sidekick character include companion, partner, ally, friend, confidant, wingman, assistant, deputy, backup, and collaborator. These characters often have unique personalities, which add depth and charm to the story. They may also serve as a foil to the protagonist, highlighting their strengths or weaknesses. Overall, sidekick characters play a vital role in storytelling, contributing to the plot and character development.