There are several synonyms that can be used for the phrase "Koto Player." One of the most commonly used replacements is "Kotoist," which refers to someone who plays the koto, a traditional Japanese stringed instrument. Another word that could be used is "Koto musician," which is a bit more formal and encompasses a wider range of musical skills associated with the koto. In addition, "Kotoist" and "Koto player" could be combined to create the phrase "Koto performer." These synonyms could come in handy when trying to spice up your writing or when trying to avoid using the same phrase multiple times.