The Mastermind / Zero
Then a mysterious girl named C.C. gives him the Geass: the absolute power to command anyone to do anything, once, through direct eye contact. He puts on a mask. He calls himself Zero. He tells himself he is doing it to destroy Britannia.
He might even be right.
Produced by Sunrise and directed by Goro Taniguchi, who made s-CRY-ed five years earlier and clearly spent the intervening time thinking about political violence and what it costs, Code Geass: Lelouch of the Rebellion aired on MBS from 2006 to 2008. Fifty episodes across two seasons built around a chess match played in real time between a revolutionary who cannot stop lying and a childhood friend who joined the empire to reform it. The show understands that both positions are correct and neither of them will survive being correct.
The plot moves. This is the understatement of the decade. Code Geass was downloaded faster than most fansub groups could release it because no one watching it was willing to wait a week between episodes. The cliffhangers are not cheap, they are the load-bearing structure of a narrative that never stops accelerating. The Knightmare Frame battles are spectacular. The political maneuvering is genuinely intricate. The character work earns what it asks of you.
The ending of R2 is one of the most argued finales in anime history. It is also the correct ending. This is not up for debate.
Fifty episodes. Clear your schedule.
Legend
The Lancelot Pilot / Tragic Rival
+15 LORE
The Immortal Witch / Code Bearer
Black Knights Ace / Guren Pilot
+6 LORE
Shirley Fenette
SPOILER!Ashford Sweetheart / Tragic Anchor
+4 LORE
Schneizel el Britannia
SPOILER!Nice Prince / Grand Strategist
+4 LORE
The Emotional Anchor / Exiled Princess
Euphemia li Britannia
SPOILER!Third Princess / The Tragic Idealist
+4 LORE
The Goddess of Victory / Viceroy
Cybernetic Engineer / Black Knights Scientist
Diethard Ried
SPOILER!Information Director / Propagandist
Student Council President / Grand Tease
Zero Requiem
The Tyrant Is Deliberate
Lelouch Takes Britannia So the World Has One Enemy
SPOILER!Turn 22 · 99th Emperor
Suzaku's Punishment Is to Survive as Zero
SPOILER! Zero Requiem · Identity Becomes DutyZero Kills the Demon Emperor
The World Watches Zero Kill Lelouch
SPOILER!Turn 25 · The Parade
Nunnally Understands Too Late
SPOILER!Turn 25 · Lelouch's Hand
Why It Works
Zero Requiem Does Not Erase the Damage
A Shared Beginning, Not a Magical Reset
The Mask Outlives the Man
SPOILER!Zero After Lelouch