Akharin
- Full Name: Akharin
- Also Known As: Alexander the Great, Leonardo da Vinci, Johannes Brahms, Wilson Evergreen, Willem Paul Abramson, Micah Brack, Flint, Emil Vaslovik (TOS: "Requiem for Methuselah"; TOS Novel: Rise and Fall of Khan Noonien Singh, Volume 1; ENT Novel: Uncertain Logic; TNG Novel: "Immortal Coil")
- Also claimed the likely-ahistorical aliases of Solomon, Methuselah, Lazarus, and Merlin; possibly claiming to have been the inspirations for these figures
- Born: 3834 BCE, Mesopotamia, Earth
- Species: Human
- Born with an odd genetic condition granting perfect cellular regeneration, essentially resulting in immortality from most causes of death (TOS: "Requiem for Methuselah")
- Gender: Male
- c.330s BCE: Takes the alias of Alexander in the ancient kingdom of Macedon, keeping it until his "death" in 323 BCE
- Seems unlikely as Alexander is well-attested as a teenager, having been taught by Aristotle among other things
- c.late 1400s: Takes the alias of Leonardo in Italy, keeping it until his "death" in 1519
- c.1850s: Takes the alias of Johannes Brahms in Germany, keeping it until his "death" in 1897
- 1984: Researching ozone repair on Earth under the alias Wilson Evergreen (TOS Novel: Rise and Fall of Khan Noonien Singh, Volume 1)
- Changes aliases shortly after an encounter with Gary Seven and Noonien Singh
- By 2165: CEO and President of Abramson Industries under the alias Willem Paul Abramson (ENT Novel: Uncertain Logic)