It's rather fun watching something with an eye out for events that could make plausible names of sorceries / instants.

This comment will be updated as I encounter more.

Those who haven't seen the series may wish to avoid reading this list, as it's roughly in chronological order of when events happen in the series, so it contains spoilers!

1. • Invasion, occupation
   • Oppression, prejudice, Embrace Inequality
   • Transport truck, transport crash
   • Two-Faced Prince
   • Concealed Mech
   • Slash Harken
   • Army Copter
   • Destroy the Ghetto
   • Kiss of Power. Contract.
2. • Ambush, Friendly Fire
   • Supply Train
   • Honorary Citizenship
   • Promote to Pilot. "Ha! I could never be a knight." "But what if you could...?"
   • Hijack
   • Mech combat, Outmanoeuvre
   • Chess metaphors: Gambit, Sacrifice, Queen, Pawn, etc
   • Undermine the Floor
   • Medical Corps
   • Infiltrate the Throne Room
3. • School Garden
   • Hazmat Squad
   • Feigned Illness
   • Geass Research Team, Monitored Experiment
   • Champagne Spill, Borrowed Clothing
   • Unexpected Phone Call, Pre-Recorded Message
4. • Information Officer
   • Settlement/Ghetto Border Train
   • Dramatic Pronouncement
   • Traditionalist Conference/Council
   • Broadcast Truck, Mobile Studio
   • Dramatic Rescue
   • Poison Gas Capsule
   • Ends Justify the Means / Ends Don't Justify the Means
   • Stay of Execution; Free the Prisoner
5. • Desert Squad
   • Arabian Artillery
   • Escape through the Window
   • Shopping Trip
   • Air Freighter, Prison Plane
   • Investigate Your Powers
6. • Mountain Base, Besieged Mountain, Artillery Emplacement
   • Equipment Case, Equipment Theft
   • Lose Footing, Slip
   • Horseback Students
   • Gardening Students
   • Rooftop Slip, Save from the Fall
   • State Funeral, Assembled Students, assembled ASEEC (all 5 of them), assorted assembled nobles too
7. • Audience with the Emperor, assorted misc nobles
   • Slump of Despair, Disowned, Disinherited
   • Demotion, Framed for Treason, Suspicion in the Ranks
   • Nice wide shot of engineering airstrip/ carrier
   • Military Roadblock
   • Threat of Suicide / Hold Oneself Hostage
   • Strike Copter; Strike (at the) Copter
   • Massacre
   • Demolish the Bridge
   • Unmask the Traitor
   • Escape through the Sewers
8. • Exuberant Sightseeing
   • Nice wide shot of mountain+ forests+ farmland
   • Absurd Student Council Order, Milly's Ridiculous Demand, Cat Party
   • Hoteljacking
   • Hotel Pier/Lake Port
   • Attack through the Tunnel, EM Shrapnel Cannon "Raikou" / Linear Cannon "Raikou", Anticipated Attack, Defense Turret
   • Proclaim Obsolete
9. • Addiction
   • Drug addiction, Raid the Drug Dealers
   • Britannian bullies
   • Manipulate the Crowd
   • Convivial chat at a bar
10. • Mountain Hideout; Craggy Lookout
    • Geass to Ignore
    • Mountain Path
    • Unrequited Crush on the princess
    • Mobile HQ, Logistical Support
    • Launch of the Gloucester Royal, Airdropped Forces
    • Landslide, Avalanche, Sweep Away the forces
    • Irresistible Urge for Combat (Jeremiah)
    • Airdrop, carrier planes
11. • Tense Confrontation (Guren vs Cornelia)
    • Behold the Beyond, Journey into Memory, Painful Memories
    • Victory for the Terrorists, Black Knight Celebration
    • Destitute Soldier, War Veteran,
    • Lost Name
12. • Ask on a Date
    • Battlefield Hospital, Disaster Recovery
    • Rakshata
    • Veiled Leader; Remove the Mask
    • Collateral Damage, Unpredictable/Unintended Casualties, Civilian Casualties
13. • "Anything gained by doing things the wrong way is meaningless!"
    • Mechanized Marines
    • Burden of Guilt
    • Underwater Mine
    • Liquid Sakuradite, Explosive Vapours, Restricted Ordnance
    • Improvised Torpedo, Launch a boat at them
14. • Landscapes: mountainside forest; memorial, Family Tomb
    • Mind Reading, Manipulate Emotions, Instil Doubt
    • Ambitions for Royalty
    • Unfamiliar Weapon
15. • Lost Memories
    • Medical Check, Consultant Doctor
    • Political Tomb
    • Dinosaur
    • Funfair
    • Nighttime Hacking, Security Bypass
    • Threaten at Gunpoint
    • Recorded Message,
    • Chainsaw Madness
    • Police Copter
16. • Aircraft Carrier; Startup Sequence, Refitted Mech, Upgrade Testing
    • Hostage in the Sewers
    • Building Schematic, Secret Elevator, Hack the Keypad
    • Turret Camera, Run Up the Wall
    • Pendulum Bomb, Cut the Detonator
    • Royal Garden
17. • Art Gallery
    • Pilot Suit
    • Imprisoned/Captured by Britannia
    • Burai Squad, Gekka Squad
    • Smash Down the Wall
    • Slice Open the Cockpit
    • Heroic BSOD when Lelouch finds out Suzaku is Lancelot's pilot
    • Fleet of airborne Reinforcements
18. • Submarine; Organisation Structure; Promotion, Special Responsibility (Kallen smiles at being put in charge of Zero Squad)
    • Knighting Ceremony
    • Pizza Party
    • Briefing the Troops
    • Engine Room
    • Diethard's motivations. "I want to be the person documenting the new era" "There's no such thing as objective information!"
    • Outpost Airstrip
    • Rapid Retreat, Boosted Retreat
    • Gunpoint Interrogation
    • Missile Barrage
    • Interposed Skyship; A New Player Emerges
    • Point-Blank Airstrike
19. • Deserted Island, Tropical Island
    • Airborne Carrier Avalon; Charming Prince Schneizel
    • Caught Unawares, Marooned with the Enemy
    • Scavenge for Food
    • Submarine Canteen; Dinner Argument
    • Search Party, Distant Searchlight
    • Excavation, Thought Elevator, Mining
    • Druid System for analysing occult data
    • Steal the Prototype; Hadron Cannon; Weapon Malfunction
    • Geass to Live
    • Assault from the Sea, Tactical Surround, Japanese warships
20. • Airborne cruiser, Airborne HQ, bridge crew
    • Submerged mech; coastal defence
    • Black Knights submarine
    • Royal limousine
    • Naval squad (cruiser+2 destroyers)
    • Air Battle; Japanese/Chinese fighters
    • Fireside Tea, Intimate Revelation
    • Gun-Ru
    • Unexpected Collaboration, Join Forces, Common Enemy, Foreshadowing
    • Resupply
    • Government-in-Exile
21. • Teaching Staff
    • Submarine Mech Hangar containing the Guren and Gawain
    • School Festival
    • Cosplay as a Mech
    • Haunted House, Gravestone Costume
    • Gaston Knights, Gloucester, Royal Regular Forces
    • Romantic moment in a forest
    • Ganymede from the Ashford family
22. • Uncontrolled Power
    • Massacre, Cruel Betrayal, Cruel Turnaround
    • Control the Media, Manipulative Broadcast
23. • Underground Lab, Frantic Invention, Obsessive Creation
    • Mysterious Child (V.V. and Sumeragi); Pact with the Devil; Dedicated to Revenge
    • Open Riots, Insurrection
    • Besiege the Capital
    • Overtaken by Hatred
    • Life Support Tank, Cybernetic Reanimation
    • Demolish the Fortress City. Transport Flight, getting smashed.
    • Collapse the Platform, Shake the Battlefield
24. • Defensive Formation
    • Artillery Battery
    • Frustrated Punch, Savage Punch
    • Mecha combat, Improvised Cover, Gekka, Glaston Knights
    • Ineffective Royalty
    • Superconducting Heavy Shrapnel Cannon
    • Lancelot dodging bullets; Duel between Suzaku and Kallen
    • Gefjun Disturber; Lead into a Trap
    • Hadron Cannon, Sweep the Skies
    • Ganymede, Upgrade with Nuke
    • Cornelia vs Zero; Geass to Betray
    • Kidnapping
25. • Dying Interrogation
    • Cybernetic Enhancement
    • Spinning orange-shaped slicer mech
    • Kill the Hostage; Interference from a Cat
    • Bolt-On Replacement Parts
    • Battlefield Promotion, Hastily Knighted
    • Suddenly Leaderless
    • Crucial Distraction
    • Intercepted Transmission
    • Mental Trap
    • Airlift
    • (39:30) Peaceful forest villa
    • Unmask
    • Enrage

--

• Surprise Deployment
• Predict Your Tactics
• Pre-Recorded Conversation
• Kidnapping, Hostage Threat, Bomb Scare

• Spinning Kick, Daring Leap

• Assault the Mountain / Assault the Base

• Cryptic Comment. "Lelouch, do you know why snow is white? Because it's forgotten what colour it was meant to be."
• Formations, e.g. Rotating Absolute Power Formation
• Exchange of Hostages
• Steal Artifact, Acquire
• Unexpected Encounter
• Resist Influence
• A tweaked version of Fisticuffs could represent Lelouch challenging his opponent to step out of their Knightmare.
• See the Big Picture
• Rebellion, Uprising, Outright Revolution
• False Memory, Overwrite Memory; Restore Memory
• Underground Base, Subterranean Control Room
• Themes like justice/injustice, righteousness, evil etc
• Incriminating Phone Call
• Stop Time / Time Stop
• Call for Reinforcements, Timely Reinforcements
• Mid-Combat Upgrade, Midair Installation
• Submerge
• Mass Disguise
• Create an Independent Nation
• Lifetime Seclusion
• Arranged Marriage
• Mental Challenge, Battle of Wits, Mind Games (I wish those names weren't taken... Mind Games would be a fair reprint if not for Buyback)
• Coup d'Etat
• Ambush
• Flood the Battlefield
• Lose Morale
• Predicted Betrayal
• Doppelganger, Ninja In Disguise
• Unlikely Alliance
• Secret Underground Research Base
• Escape Tunnel; Deny Escape
• Psychic Connection
• Lose Memory, Regress
• Sword of Akshasa, Deicide
• Unintended Betrayal
• Forsake Compassion, Grow Callous
• FLEIJA, FLEIJA Detonation, Scour the Settlement
• Dissension in the Ranks, Wavering Loyalties, Fractured Loyalty
• Lèse Majesté, Line of Succession, Claim the Crown, Assume the Throne
• Ragnarok Connection
• Ancient Relics
• Meet Inside the Psyche
• Strategic Location, Converge on the Island
• Portal to Another World, Collective Unconscious, C's World
• Drop from the Ceiling
• Inverted Loyalties, Shifting Loyalties, Twist Allegiance