The nerd-to-tyrant arc is fascinating because it's not just about a power switch, it's about a worldview calcifying. The character often starts out valuing knowledge and precision, and when they get power, that same obsessive detail-orientation gets weaponized into micromanagement and paranoia. Relationships don't just sour; they become asymmetrical warfare.
The people who knew the 'before' version are the biggest threats and the most deeply betrayed. The clever best friend who helped with schemes becomes the first to be monitored. Loyalty gets redefined as blind obedience to the new system, not to the person. Romance is particularly brutal—any partner who loved the awkward, passionate nerd is now staring at a cold strategist who sees emotional connection as a variable to control. It makes you question whether the tyrant was always there, waiting, or if the act of gaining power inherently corrupts that specific mindset.
What gets me is the loneliness. The tyrant often ends up surrounded by sycophants who never knew the real person, while alienating everyone who did. It's a self-made prison.