Rosa's final actions at the end of Episode 2: she faces down an entire army of demon goats with only a Winchester 45, a pen, and a gold ingot. It was awesome enough to inspire her own video game.
The whole ending of Episode 2, with the hunt, Rosa protecting Maria, then finally they put up a last stand together ending in a Rosa firing some shots with pictures flashing by ending with the Umineko logo and then the When the Seagulls cry message and all of this accompanied with probably the most badass of the music in the VN (which with how good the soundtrack is quite amazing) Worldend Dominator. Seriously just watch it.
Beatrice's first entrance in the anime. If there were any scenes in the anime that did the Visual Novel justice... Basically, Battler announces that if the others want to prove Beatrice's existence, they'll just have to bring her here. Guess who appears right behind Battler only seconds after his announcement?
Episode 3... pretty much all of it, actually. But to list just a few:
The entire Myth Battle between Beatrice and Virgilia. Even if it technically didn't happen, it is still awesome for both witches involved.
Kyrie and Rudolf facing off against two of the Seven Stakes, and Kyrie defeating her opponent by basically out-envying her.
Speaking of Rudolf, let's not forget this little exchange:
Belphegor:Resistance is futile. You don't need to think about anything. Just close your eyes. I'll finish everything gently.
Kyrie's fight in the manga consists of Leviathan in her stake form bouncing around Kyrie at high speed, all while Kyrie is recounting her relationship with Rudolf and her personal envy of Asumu. She then, without looking, grabs Leviathan as she flies past Kryie's head.
Beatrice's elaborate ruse where she convinces Battler she has turned over a new leaf, right up until he's about to sign a contract that admits his defeat?
What lead up to that - the incredible battle in the hall where Beato was shot through so many times that nothing but a HEART remained, and she still managed to hold off Evatrice... and the meta battle between Battler and Evatrice.
As bad as this may sound, Battler standing up to Beatrice by slapping her and generally telling her he's not going to take her crap anymore. Considering everything the guy's been through up to this point thanks to her and some of her actions, that was intensely satisfying.
The two battles between Gaap and George and Jessica and Ronove wherein they are forced to make a Sadistic Choice, but instead go for a third option—fighting their opponent.
And even when it looked like George was about to make one of the three choices on which life to sacrifice—his own, his lover's, or everyone else's—instead of going for the obvious and making the Heroic Sacrifice choice Jessica made, he simply chooses for everyone else to die. To this troper, watching George beat down the barrier for the choices a hero usually makes in favour of a choice that wouldn't be traditionally heroic was just...amazing. Of course, it also makes the following moment even more awesome:
The ending of Episode 4 where Battler denies Beatrice with the blue truth qualifies...but when read in the proper context, it becomes a Tear Jerker.
In Episode 5, Erika is about to trap Kinzo in a closed room in his study on the third floor. Battler smashes that closed room by proposing that Kinzo could've escaped by diving out the window... and then proves it by doing so himself. Crazy Awesome: It's In the Blood.
The hidden tea party of Episode 5. Battler faces off against Erika, the Eiserne Jungfrau, and Bernkastel at the same time, gets back-up from Ronove, Virgilia, Gaap, and the Seven Stakes...and discovers the Gold Truth that only the Game Master can use.
The last chapter of EP6 has one for almost every fantasy character.
Beatrice, after spending two whole games absent from the real Beato's face, we finally see her old self. She fearlessly crashes an armed wedding, and after staring at Erika greeting her, lets out her low, characteristic chuckle, which causes even Battler to react. Then she slowly raises her pipe, then progressively goes up from serene face, to gentle smile, to grin, to the long awaited sneer. After that entrance, she proceeds to calmly demand a duel from Erika, even though she could be killed at any moment, and then solve the closed room problem no one else could, then.
She and Battler get another, amazingly epic one at the very end of the episode, with just one line, after Erika declared in red that she's the 18th person on Rokkenjima: "Sorry, but-" "Even if we include you-" ""There are seventeen people.""
Virgilia, Ronove, and Gaap taking out the Siestas.
The Stakes of Purgatory showing how deep their loyalty for Beatrice and Battler goes when they defy Erika and take down Gertrude's barrier.
Battler: "Maria, it's ten years early for you to tell someone to eat you. Make sure to tell me that in ten years, alright?"
From the second tea party as well: "Looks delicious. Slice up your cowtits and make me a sandwich." Especially in context: After her sound victory, Beatrice is torturing Rosa by making her eat remains of her siblings and more or less crossing the Moral Event Horizon by presenting Maria's head, who suddenly starts to beg. The game is already over, nobody is coming to save her, Beatrice laughing hysterically towards a perfectly plausible Downer Ending scenario... then that one line comes up, effectively and utterly destroying the hopeless mood. Cue Battler's Big Damn Heroes entrance.
Made several times more awesome by him smashing Beato's face into the table immediately after saying this. Too bad the anime didn't show it.
Dunno if many people caught this, but the fact that Siesta 410 has faith in Battler in EP5. At one point during the main story, Battler is trying to argue a way to help the witch Beatrice and the phantom of Kinzo out of the closed room Erika has constructed, with the help of the Siesta Sisters and the Eiserne Jungfrau. After he's told that escape is impossible, 410 simply comments, "But he'll do it anyway." And then, during the hidden tea party, Battler is revived from death, ready to fight again. Bernkastel orders the Siestas to fire and destroy him; while readying to fire, 410 has a sad, apologetic look on her face. Right after it's revealed that they can't fire on him, her face has become a triumphant grin. When asked why they didn't fire, and it's revealed that Battler is the new territory lord of the fragment, 410 comments, "Nihi, I told you he'd do it."
Dawn again: The Stakes' subverting Erika and Dlanor to help Beato and Battler out when Beato makes her return. Gertrude is holding up a barrier that Beato won't be able to get through, and the Siestas are quickly rebooting, almost able to take Beato out. The Stakes want to help the two out, but are unsure of how to proceed, because technically, Erika is currently commanding them. (Battler was comatose, and Erika married him; as his wife, she had the right to speak on his behalf and command what belonged to him.) Dlanor specifically tells Lucifer, "You are not allowed to move except by the orders of your MASTER." Then, this conversation occurs:
Leviathan: Who's our master?!
Satan: It's Erika now, idiot!
Mammon: No, our master is Battler-sama!
Belphagor: True, she only speaks on his behalf.
Asmodeus: That's right, big sister! Whose furniture are we?
Beelzebub: It's just too delicious! Let's eat!
Belz shoots forward and stakes Gertrude, but the barrier doesn't break. Gertrude just looks at Lucifer, and asks, "By whose orders? Know that Lady Erika has made no such order." "We do have orders. Th..the orders of our master!" "How can a master who cannot speak give orders?" "E..even though he can't talk, understanding a master's will is furniture's job!" With that, the six other Sisters all stake Gertrude, whose barrier shatters.
Episode 7. Eva in the Tea Party surviving Kyrie's massacre and finally managing to take she and Rudolf down, then swearing to take care of Ange and ensure that she never learns the truth about her parents. Also counts as a Tear Jerker when you know how she and Ange's future turns out...
Episode 7 again: Will crashing the Tea Party to protect Lion from Bernkastel. Starting from when he freezes time and slices the screen apart to stop his murder, and then angrily refusing to allow Lion to even consider giving up. Getting thrashed by Bernkastel and losing his limbs does nothing to shake his absolute determination to save Lion and Beatrice, even at the cost of his own life.
Lion also gets to contribute by refusing to obey Bernkastel when Bernkastel orders him to beg Will to drop him and save himself. Instead, together with Will, he declares that they will escape and keep fighting for their miracle. Right to the face of the Witch of Miracles herself.
Both made it more awesome by the fact that Episode 8 reveals that they SURVIVE. SOMEHOW.
Well, thanks, Lambda. Everything she does is awesome.
Also, specifically during the goat fight: Will HEADBUTTING A GOAT TO DEATH after it insults the mystery genre. The looks on everyone's faces as he does it are simply priceless.
Even before Lambda vs. Bern itself, Lambda sacrificing her own livelihood to bring Battler and Ange to Featherine's party and then later losing the game of rock-paper-scissors on purpose so that she would be chosen as the sacrifice should definitely count.
Episode 8 is more or less the only episode with Ushiromiya Kinzo interacting with the other characters as himself in true Ushiromiya Kinzo fashion. That should speak for itself.
A Fridge Brilliance CMOA for Battler, if you subscribe to a certain theory about EP6: if you believe he planned the entire thing, he managed to fool both Erika and Bernkastel into thinking he was a completely incompetent mess, while in reality he knew exactly what he was doing and was betting everything to save Beatrice. Just the fact that he was willing to spend years inside that horrifying closed room in order to revive her makes the episode that much more amazing.
Let's put this in perspective. Not only did he fool Erika and Bernkastel, he fooled the readers, most of whom thought he was being an idiot. How's that for a Meta-twist?
The fantasy characters shooting down goats like there's no tomorrow.
Two closed room duels - Battler vs Erika and Beatrice vs Ange, happening at the same time, with this song in the background. For added awesomeness and badassery, Battler takes off his cape and throws it, before starting his duel with Erika.
And of course, the aforementioned Will headbutting a goat to death.
Rosa almost-killing Erika four times at once (including shoving a gun straight down her throat and firing and punching a pen through her eye socket) after she yells to Maria that Rosa never loved her. Erika manages to survive, just, only for Rudolf and Kyrie to start shooting at her - in perfect synchronization, with the bullets from their guns bouncing off each other in mid-air. And THEN, after running from them, Dlanor declares that her actions are unforgivable and issue a No-Holds-Barred Beatdown that forces her old friend to flee the battle. Seen here.
And then there was a final Crowning Moment of Awesome for the whole family at the climax, but especially Ange. When she realizes her power as the Witch of Resurrection, she brings back Battler and every single one of her friends and family, real or imaginary, human or otherwise, who had died in the Golden Land just moments ago. Bernkastel's attempts to destroy them with the red truth are negated byeveryone's gold truth, which they then pool into a single, massive attack that tears through all the blue truths Bernkastel had been massacring Battler a minute ago and then continues on to her, finally defeating her. The Witch of Miracles was felled by not only Battler and Ange, but the entire Ushiromiya family and their friends. When you think of how much pain and suffering Bernkastel had caused them all, no defeat could be more fitting.
And let us not forget the group that made it possible for us to read this series, Witch Hunt. Their work has been nothing short of amazing and with no payment, hundreds of fans constantly wondering when the next translation will be up they have now finished the series. You guys are nothing short of amazing and well deserve the praise R7 gave you.
Natsuhi's Mama Bear moment for Jessica by taking a stand against Beatrice in Episode 1. It fails miserably, resulting in her death, but given her Chew Toy status, you have to give her props for having the courage to do that for her daughter's sake.
In the beginning of Episode 5, we see Natsuhi getting into an argument with Krauss over his really stupid decisions and how he squandered the family fortune. When he starts getting too excited about the idea of fixing everything with Kinzo's hidden gold, Natsuhi actually slaps Krauss to get him off her. To clarify, Krauss was actually afraid of her and recoiled even though Natsuhi only slapped him to get him to calm down. Still, it showed there was a limit to how much stupidity she was willing to put up with from her husband.
While these days it is almost impossible to not know about Bernkastel's true personatliy, back when it still was not a widely known fact, the ending of the secret tea party of Episode 4 definitely qualified. Starting off almost cute, the scene quickly turns into a Curb-Stomp Battle without the defending party even being present as Lambdadelta piece by piece tears apart all the solutions for the mystery that Beatrice just accepted in her final fight against Battler. Things get calmer again, with Bernkastel and Lambdadelta talking casually with each other once more. Then, suddenly, the music fades, and both of them declare Beatrice's certain defeat. The truely epic and terrifying staff credits music from Episode 1 fades in, and for the first time, we see Bernkastel laughing diabolically, revealing her true nature and setting the stage for all the Episodes to come. Truly a CMOA combined with what was back then possibly the biggest Oh, Crap moment ever.