The phrase "straight man" is often used to describe the role of an individual who is the voice of reason, often in a comedic or theatrical setting. However, there are a variety of synonyms that can be used to describe this character type. For example, the term "foil" is often used to describe the straight man in a comedic duo, contrasting with the antics of their counterpart. Another term that could be used is "voice of reason," as this character provides balance to the often illogical or absurd behavior of others. Additionally, the term "anchor" could be used to describe this role, as they provide stability and grounding to the situation at hand.