Second bananas is a phrase that typically refers to individuals who are in a secondary or supporting role to someone else. There are several equivalent expressions that can be used interchangeably with this term. One such synonym is "sidekick," which implies a loyal and dependable friend or partner who follows the lead of the primary figure. Another similar phrase is "wingman," which is typically used to describe an ally who assists and supports the protagonist in a social or romantic context. "Assistant," "deputy," and "lieutenant" are other synonyms that convey the sense of a subordinate figure who aids the primary character.