A supporting character is a key element in storytelling as they help build the plot and bring depth to the protagonist. They are often overlooked, but without them, the story would not be as rich. Synonyms for supporting characters include sidekick, companion, ally, confidant, co-star, and secondary character. These characters are there to offer different perspectives and aid the protagonist's journey. They provide comfort, advice, and moral support. Sometimes, the supporting character can steal the spotlight as they have a compelling backstory and intriguing personality. In conclusion, supporting characters are an integral part of storytelling, and without them, stories would not have the same impact.