What is Lelouch's core teaching about power?

That every power accumulates a cost, and the cost compounds. Each use of Geass creates a consequence he must manage. Each political victory creates a new enemy or a new obligation. Power isn't a simple resource — it's a system of escalating commitments, and the entry cost is cheap compared to the maintenance cost.

What does Lelouch teach about the relationship between ends and means?

That they're harder to separate than they appear. He tells himself he's building peace. But the means — mass manipulation, war, assassination — shape the world he's building. By the end, the only way to complete the vision is to make himself the symbol of everything wrong and die for it. The means became the ends. The Zero Requiem is as much an acknowledgment of this as it is a strategy.

What does Lelouch teach about carrying things alone?

That it's both necessary and destructive. He isolates himself from genuine support because the plan requires secrecy. The people who love him — C.C., Suzaku (eventually), Kallen — can't fully help him because he can't tell them everything. Isolation in the name of the mission is one of the things that makes him most tragic.

What is the most transferable lesson from Lelouch?

That the strategy must account for what happens after the victory. Most plans stop at winning. Lelouch's genius — and his tragedy — is that he planned all the way to his own death and what the world would look like after it. Most people planning big things forget to plan the aftermath.

Why does Lelouch remain compelling as a moral character?

Because he's wrong in specific ways, not vague ones. His methods are questionable in ways we can examine and debate. He makes us think about power, sacrifice, and self-deception with unusual precision. That's the work fiction does best.