The term 'COMIC's Sidekick' can be summed up as a character who assists the main protagonist in a COMIC book or graphic novel. The crossword solution for this term is FOIL, which stands for 'FOIL to the Hero'. This term is used to describe a character who provides contrast to the main protagonist, often by being the opposite of the hero in terms of personality, abilities, or goals. This type of character is often used to create tension and drama in the story, as well as to provide comedic relief.