The term "adventurer's sidekick" refers to a person who accompanies the main protagonist or hero on their journey or quest. However, there are many synonyms for this term that can be used to describe this character. Some of the most common synonyms include companion, ally, assistant, partner, confidant, and apprentice. Other possible synonyms for an adventurer's sidekick might include co-pilot, wingman, backup, supporter, follower, or aide-de-camp. The specific term used to describe an adventurer's sidekick may depend on the context and genre, as well as the relationship between the main character and their companion. Regardless of the synonym used, this character is often crucial to the success of the hero's mission.