Most fascinating but lesser-known Roman emperor?

[🦀🎂🦀🎂]

Justinian's II "the Slit Nosed" - real bastard who lived life as a Shakespearean anti-hero. Deposed, had nose cut off, formed various Machiavellian schemes to come back.

Andronokus I - spent his life as an unbelievable villain who was constantly seducing underage family members and destroying their marriages/engaging in light treason and improbably became an emperor as an old man, where he somehow became even more evil and killed everyone around him, including most of his extended family.