Akharin
- Full Name: Akharin
- Also Known As: Alexander the Great, Leonardo da Vinci, Johannes Brahms, Wilson Evergreen, Lewis Bixby, Jerome Drexel, Alexander Micah Brack, Jacques Tarrant, Willem Paul Abramson, Antonius Taranullus, 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
- 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, abandoning the alias after an encounter with Gary Seven and Noonien Singh (TOS Novel: Rise and Fall of Khan Noonien Singh, Volume 1)
- Early 21st century: Takes the alias of Lewis Bixby, keeping it until his "death" in 2053 during the bombing of New York City (SNW Short Story: "Immortality Blues")
- 2053: Takes the alias of Jerome Drexel, as which he aids in the rebuilding of society post-World War III (SNW Short Story: "Immortality Blues"; ENT Novel: Uncertain Logic)
- By 2073: Takes the alias of Alexander Micah Brack, historian (TOS Novel: Ex Machina)
- 2101: Takes the alias of Jacques Tarrant in North Africa, keeping it until his "death" in 2139 soon after the death of his wife (ENT Novel: Uncertain Logic)
- 2139: Takes the alias of Willem Paul Abramson (ENT Novel: Uncertain Logic)
- By 2165: Founder, CEO, and President of Abramson Industries (ENT Novel: Uncertain Logic, Live by the Code)
- Late-2165: Takes the alias of Antonius Taranullus (ENT Novel: Live by the Code)
- By February 2269: Takes the alias of Flint (TOS: "Requiem for Methusaleh")
- By c.2305: Takes the alias of Emil Vaslovik, professor of cybernetics and artificial intelligence, following the "death" of Flint (TNG Novel: Immortal Coil)
- Served as guest lecturer at Daystrom Institute (TNG Novel: Immortal Coil)
- By June 2374: Civilian lead, holotronic development project; Daystrom Institute, Galor IV annex (TNG Novel: Immortal Coil)