Mako not thinking twice to dive into the ocean and save Joey and Yugi when the former dives in to try and save the Exodia pieces.
Edwin's first Rage Breaking Point: realizing Weevil could have killed Joey and Yugi thanks to his actions, he storms into the main dining area of the cruise ship and abducts Weevil before taking him to a secluded area of the ship and threatening to throw him overboard. Weevil manages to bribe his way out by forfeiting his room key.
Yuri showing just why she's a worthy addition to the world by taking out the traitorous KaibaCorp security goons that are holding Seto's staff hostage in his mansion.
The fact that Edwin was able to prevent Mokuba's re-kidnapping, putting a major wrinkle in Pegasus' plots.
Edwin's Xanatos Gambit to deal with Yami Bakura during the first Shadow Game: Do nothing. Either Yami Bakura passes out due to lack of food and drink (since he's still tied to a physical body) or he makes a mistake that costs him the game. It becomes the latter, winning the Duel with ease.
Selene making her grand appearance by utterly no-selling Yami Bakura and warning the Pharaoh that Edwin belongs to her.
PaniK and Renard vs Yugi and Edwin:
Renard showing there were some good Eliminators on the Island. He is an incredible Duelist who nearly beats the heroes and loses with grace.
Edwin mocking PaniK and using The Killers' "When You Were Young" to break Mai out of her depression, rekindling her fighting spirit.
When PaniK activates the fire nozzles on the platforms, Renard saves Edwin from burning to death.
The Pharaoh, enraged, mind crushes PaniK for his actions.
Kipling Chaos, realizing that his nephew is in danger and Police Are Useless, forms an alliance with Yuri to send a private military force to invade Duelist Kingdom and save Edwin and Tea.
The fact that Yuri and co DO IT. By the end of Duelist Kingdom, Pegasus and his entire staff have been arrested and the island secured.
The Deal With the Devil. Edwin, using quick thinking and knowing that Pegasus and Seto desperately want to Duel one another, forces the two to make a deal with him. The result? Edwin takes over the Big 5's total shares in KaibaCorp and Industrial Illusions, becoming one of the richest men in the world in mere seconds.
Because Pegasus and Seto each control equal amounts of their now-merged company, Edwin becomes the King Maker: in order to get something done that the other disagrees with, they have to go through Edwin.
The fact that Edwin was one turn away from defeating the Pharaoh and facing Pegasus. Perhaps more impressively, the Pharaoh respectfully acknowledges that Edwin would defeat Pegasus if he moved on, without even knowing of Edwin's newly acquired immunity to the Millennium Eye thanks to his own item.
Yuri taking down her father after he mortally wounds Edwin.
Mokuba coming up with the solution of sticking Edwin in the Virtual World simulation in order to save his life.
The entire gang spending over a month leveling up in the game, becoming the leaders of their guilds in order to be ready to free Kaiba.
Edwin fully bonding with the Millennium Key, causing him to gain Glowing Eyes of Doom and full mastery over his new Shadow Realm powers, after Mai, Joey, and Mokuba are seemingly killed
The epic beatdown Edwin gives the Big 5, growing to giant size and tearing them apart with his own bare hands. As one of the members comments:
Leichter: We never stood a chance.
Dark Reflections Arc
Upon finding themselves on Earth-2 and confronted by Evil!Serenity Edwin finds her invading his mind... only for SOMETHING within him to brutally rip her soul from her body, locking it in a casket and chaining it up forever in the Shadow Realm
Unleashing his newly unlocked power Edwin blows out every window in the hospital they are in while informing the Rare Hunters just how dangerous he is. All while Troy blasts "Words Win Wars" throughout the building.
Edwin's evil counterpart Aiden Order and him Dueling it out, with Aiden being the Duelist, after Yugi, to give Edwin the most trouble.
Edwin staring down the King of Domino and scaring him so badly he ends up running from his throne, Edwin taking it as he finishes the duel.
Aiden revealing that he planned out the entire arc JUST to get Edwin there to help him overthrow the King of Domino and take his place.
Edwin responding by tossing Aiden through a door portal into the arctic.
Battle City Arc
Renard returning to save Edwin from the Rare Hunters
Edwin refusing to let Renard bow to him, instead declaring that they are allies. As the chapter states at the end, that was the moment a lifelong friendship began.
Tea, now possessing full Dueling Abilities thanks to Aiden Order, destroying Johnny Stepps herself.
Edwin's announcement that he and Mai are entering the Battle City Tournament. He hacks into every screen in the Domino Plaza while blaring Eninem's "Without Me" and simply declares they are going to win.
The Musical Episode ending with Edwin revealing his full Shadow Realm magic to the Domino Police Force when they try and arrest Yuri in order to keep her quiet. He shoots off a pillar of energy the entire city can see, destroying the mall while warning the police that he is the Guardian Devil and Yuri is under his protection.
Tea, during the final song, boldly declaring she's done sitting on the sidelines: she is entering the Battle City Tournament.
Tristan doing the same thing!
While trying to free Rare Hunter Cabal from Marik, Edwin unlocks something deep within him, causing shades of his past self as Endymion to suddenly appear. The moment he does, the battle is over and it becomes a raw beatdown of Marik.
Endymion's magic is so powerful even Selene feels it, rushing to her lover's side.
What weapon does Edwin select to battle Marik in the mindscape? A Keyblade.
Who is the first person to make it into the Battle City Finals? Tea Gardner!
Friends To The End:
Unlike canon where Yugi was Dueling a brainwashed Joey, here, Joey and Yugi have to rapidly plan out how to prolong the Duel as long as they can lest Serenity or Solomon be killed.
Odion finally realizing Marik has gone too far and helping Mokuba and Seto contact Edwin and his group.
Odion racing to save Serenity.
Just when it looks like the Pharaoh will have to defeat Joey and cause Serenity to die:
"MARIK!"
Edwin... had come at last.
Edwin challenges Marik to a Shadow Game in order to stop the Duel. The rules are Marik's Rare Hunters versus "The Champion of House Chaos". Who does Edwin choose?
Edwin: I name... as the champion of House Chaos... fire.
Into The Chaosverse Arc
Josiah Chaos pulling off a Big Damn Heroes to save the gang from Enigma's group.
Edwin reveals his final plan to defeat Enigma's army: Aiden Order. Cue his evil counterpart using his Millennium Rod to take over Enigma's entire army.
Wyatt Chaos utterly destroying that very army from above, proving why he deserves to be the next Big Bad of the Multiverse Saga.
Battle City Finals Round 1
Tea breaking Ishizu's nose after getting tired of the woman's cryptic hints and covert plots.
Renard coming within a hair's breath of defeating Kaiba.
Brom Bones revealing he isn't just a single episode opponent by defeating Joey and moving on to the next round.
The Chaos Contract
Edna pushing past her utter TERROR of Wyatt in order to pretend to be Edwin just to buy him time to rescue the captured Chaoses.
Chaos Prime, a Chaos from a Transformers universe, leading the charge of other Chaoses to save the gang during the battle.
Solomon Muto proving himself worthy and gaining the Green Lantern Ring in order to protect the kids.
The Forging of Gleipnir's Cord. Because of his kindness, Brok and Sindri forge Edwin his own godly weapon, on the level of the Leviathan Axe and the Blades of Chaos.
The Lady of the Forge revealing that Edwin's blood is powerful enough to forge the weapon, stating he is "The God of Chaos waiting to be born".
NONE, a Chaos who became trapped in a time-looping Pokémon world, is revealed to be Missing No, utterly destroying everyone in front of him when Wyatt gives his best friend Slash a cut.
Battle City Finals Round 2
Yami Ishizu delivering an insult that, while in-story no one understands, the audience realizes is utterly cold.
Ishizu: (Koyo) is only meant to give a deck to the True Hero.
Renard's backstory: he was part of an Eastern European Crime Group and performed 10 tasks to free himself from them.
The reveal that Solomon Muto ALSO did the 10 tasks.
After Yami Ishizu kills Edwin soul collectors representing nearly every Death God show up to claim his soul... only for Brom Bones, the ancient death god, to move to block them, refusing to let them pass.
When Wolf shows up Brom and him battle on top of the blimp.
Edwin's return to the land of the living
Rather than Shadow Magic Edwin seems to be charged with Holy Magic, his eyes changing from Black with Gold rings to Gold with White rings as angelic wings burst from his back and he purifies the Millennium Key while turning the Shadow Realm into a Realm of Light.
Yami Ishizu, fused with Obelisk, moves to attack Edwin only for him to easily block the punch with one hand before the Souls of Kul Elna to possess him to tell Yami Ishizu that Edwin will save her too.
The Pharaoh taking the title of The Guardian Devil after Edwin dies, complete with the same glowing eyes as Edwin. The Torch has been passed.
Yugi being the first to hurt Ishizu for what she did.
Brom saving the KaibaCorp aide from Marik's attempted rape, deciding to No-Sell his attacks with the Millennium Rod and make clear how little he thinks of him.
Brom vs. Marik. Decide Brom losing his utter dismissal of Marik is so powerful that it is clear that while Marik won the duel he lost everything else.
Noah proving to be the first villain to be altered thanks to Edwin's own cunning: he purposely keeps Yugi and the Pharaoh OUT of the Virtual World so they can't interfere with his plans.
