When describing someone who talks a lot, the phrase "most chattery" might come to mind. However, if you're looking for different ways to express this same sentiment, consider using synonyms such as garrulous, loquacious, verbose, voluble, or gossipy. Each of these words carry slight differences in meaning, but all convey the idea of someone who talks excessively or at length. Another option is to use descriptors like verbose, talkative, chatty, or gregarious to paint a more detailed picture of the person's personality or communication style. By diversifying your vocabulary, you can create a more engaging and descriptive piece of writing.