The phrase "complains of" can be substituted with a range of different synonyms in writing, depending on the context and tone of the sentence. For instance, "bemoans", "protests", "laments", and "grouses" can all be used to express a sense of dissatisfaction or frustration that someone is feeling. Additionally, "reports", "notices", and "identifies" can be used to describe a statement of an issue or concern without necessarily expressing negative emotions. Other synonyms such as "groans about", "whines about", and "moans about" can also be used, but with more negative connotations of excessive complaining or whining. Ultimately, the right synonym choice will depend on the language and mood the writer wants to convey in order to convey the character's true feelings.