Neon Genesis Octavia

One day, Octavia Melody the gray background pony had finished performing in a street concert at Tokyo-3, playing the ear-wormy opening of the iconic deconstruction of Super Robot shows. Standing on top of her mobile stage, she stuck out like a sore thumb because she was a pony in a human world. After the concert, she heard lots of explosions in the distance. A huge army was attacking a giant black humanoid with two skull faces, skeletal shoulder pads, and an open rib cage with a glowing orb. This Robeast was called Sachiel. It used a large, orange, and hexagonal AT Field to easily block all the missiles thrown at it by helicopters and tanks. One of the pilots shouted, "EVERY SINGLE MISSILE HIT THE TARGET!" before being blown up by a pink laser shot out of Sachiel's arm. He then stepped on some tanks, blowing them up too before crushing a much larger rocket with his arm and punching out helicopters as if he was swatting mosquitoes. Some missiles fell on him, did zero damage, and squeaked like rubber ducks.

At this point, Octavia saw one of her black-haired crowd members being picked up by a purple-haired woman, Misato Katsuragi. "Shinji Ikari, you are needed in the defense force of NERV right now!"

"That's him. The kid who ruined it all," she thought, her face set in determination. Her mobile stage transformed into a flying platform in order to follow Shinji and Misato as they drove towards the NERV building. Then the army attacked Sachiel with another explosive. Octie flew to maintain a safe distance from the explosion. The car Misato was driving flipped over, neither passenger receiving injury, oddly enough. It got back up and reached the NERV building at the same time as Octie. Behind the three of them, Sachiel regenerated the damage he took.

Some nondescript men said, "The Angels are back. They caused the Second Impact and are preparing to cause the Third Impact. We need to use a secret weapon to stand any chance against them. This Angel is called Sachiel. Since the Angels are Robeasts, the enemies of giant robots, it's natural that a giant robot should fight them."

Upon reaching the NERV building, the GeoFront, Shinji and Octie met the cold father known as Gendo Ikari. The tall black-haired man with shades and white gloves said, "Shinji Ikari, after a million years I finally have a use for you. Get in the *dolphin noise*-ing robot!" He pointed to a large purple face in the pool nearby. It had a large horn on its head.

Shinji replied, "NO! I CAN'T DO IT! I DON'T HAVE A SPINE, COMBAT EXPERIENCE, OR ANY SELF-ESTEEM! I'M NOT SIMON THE DIGGER! I'M NOT LUKE SKYWALKER! NOR AM I A POWER RANGER!"

Octavia joined in, "You have never treated him like a living being. That's why he's whining. Why don't you let me go instead since I don't have his psychological problems? I, Octavia Melody, don't need that robot. Instead, I've got this flying device I'm standing on, a cello that can destroy anything with its music, and a bow that can cut stuff as if it wasn't there. I've been performing on the street, and discovered that my cello has these powers when freak accidents would occasionally happen in my concerts. My bow would fly and cut something, and random stuff would occasionally break while I was playing my cello."

Gendo said that he didn't need Octavia right now, but rather Shinji, much to her dismay. She tried to convince Gendo to let her fight Sachiel. "It would be very traumatizing to bring a child soldier like Shinji into a real battle like what you're about to do. Especially if they're mentally unstable, which will only make things worse. Far worse. His depression would destroy the world!"

Gendo told her, "No, Octavia. Only Shinji can pilot that giant robot." He brought in a heavily-bandaged blue-haired girl in order to blackmail Shinji into piloting the robot. As Shinji got inside, the purple robot started to rise up out of the building in order to face Sachiel.  Gendo then said, "Don't get yourself killed, Shinji."

Octavia then decided to perform for NERV to demonstrate her abilities while Shinji tried to fight the Angel without any combat experience. She was secretly jinxing his robot, called an Evangelion, with her superpowered cello. Attempting to figure out how to operate the robot, Shinji slowly walked up to the Angel before fumbling from being jinxed, then tripping over a rock and faceplanting into grass. Sachiel picked him up before pummeling his face with laser beams. The EVA got thrown backwards, got up, and charged at Sachiel, but then  tripped again from still being jinxed. To everypony's surprise, including Octie's, Sachiel yelled "AVADA KEDAVRA" and shot both the EVA and Shinji dead with a green laser. Meanwhile, Octie sliced apples on the table with her bow by throwing it and having it boomerang back to her. She also broke glass with her music.

Misato yelled, "SHINJI! The controls are offline and the life signals have stopped completely! Get out of there this instant!" And NERV managed to get Shinji out of the battlefield, only to find him motionless with his eyes and mouth open as if he was shocked.

When Misato asked a nondescript crew member about the damage, the man said, "He's dead, Jim. And since Eva-01 would only work with him, we no longer have any use for it."

Misato replied, "What about that gray pony who claims to be a superhero?"

Then Octavia, still performing and demonstrating her weapons, remarked "See? I knew that this wasn't a good idea at all. Unlike in the anime this was based on, Shinji isn't the main character of this story. I am. That's why he got hit by that Unforgivable Curse which kills people. Now it's my turn to take out the trash." She flew outside the building with her cello and flying platform to take over for Shinji. Upon emerging, she dodged lasers from Sachiel while playing her cello to charge up a strong sound blast that shattered his AT Field and threw him backwards upon release. He smashed into a large concrete wall as he landed, then the wall fell on him and shattered. While lying on the floor, he shot at her again, but she weaved through his lasers and threw her bow. While flying, the bow span around, cut Sachiel's arms off, and boomeranged back to Octavia. She then flew up to him and smashed his head with her cello multiple times. Afterwards, she flew away from him and threw her bow right into his glowing core, cracking the core. Five seconds later, she raised an arm and the bow returned to it for her to strike another note. "Yippie kie yay mother bucker." And as her bow swept across her cello, Sachiel exploded.

Misato praised Octavia for saving the city, and took her to be assigned accommodation. "Good job pony superhero. I thought Shinji was the chosen one. But you seem to be much better. You didn't even need the Evas, one of which we can no longer use."

Octie was able to enjoy her victory afterwards, and the next thing she had to face was superhero fame. "Screw the Chosen One cliche, if there is somepony who can do something better, so be it!"