Thanks to SuperNova23 for writing the fight scene for me.
The Shadow howled with laughter; dark red energy swirled around it as it seemed to suck in energy from the environment. Then the vortex dissipates; a new figure stands in the place of her copy—the fake—that looks much more threatening.
One half of it was covered in shining black armor, an obsidian sword held loosely in its hand. The other half was pure white with a noticeable difference in the breastplate. It was modeled for a well-endowed woman, and instead of a full suit of armor, below the waist was a ruffled skirt and greaves covering the leg. In the white-gloved hand, it held a thin, white staff.
"I am a Shadow, the true self... The heroes never die! Watch, I'll prove it to you!" The Shadow cried, raising its staff, creating a powerful whirlwind that threw her back a fair distance, until she was caught by something. She looked around, and saw it was some kind of humanoid frog wearing a scarf, and holding shuriken. It set her down gently before charging forward, returning to the boy with headphones.
Three glowing cards descend to the boy with silver hair, the girl in a tracksuit, and a black-haired girl in a red cardigan. They break them, and the sound of glass shattering echoes around. A masked metal man with a large naginata came to the silver-haired boy. A woman in a yellow jumpsuit holding a double-bladed staff came to the girl in the tracksuit, and the cardigan girl recieved a pink woman with fans of cherry blossoms.
The four began to release a barrage of electricity, wind, fire, and ice. The Shadow raised her staff, blocking the attacks, a shield forming until the attacks fizzled out. The tracksuit girl ordered her creature forward, and it raced ahead, swinging its weapon, only to have it blocked by the sword. Their blades locked before the Shadow overpowered her, and threw her back to her master.
The Shadow readjusted the sword in its hand, chuckling. "Give it up! You don't stand a chance!" Headphones Boy pointed, and his frog-ninja began to toss shrunken at the Shadow, which were parried easily by the Shadow's sword. At the same time, the tracksuit girl ordered another charge. The Shadow raised its staff, a wall of wind halting her creature from moving forward.
The silver-haired boy looked at the cardigan girl who nodded; her pink woman sent off what looked like needles which erupted into flames as they made contact with the Shadow's skin. She smiled. "Yu-kun! Go for it!"
Silver-head (she guessed his name was Yu), smirked, pushing up his glasses. "Izanagi!" His creature flew forward, but the Shadow moved its sword to blade lock with Izanagi's naginata. The frog took the chance to fly over, and slam its fists on the Shadow's head.
"You're hurting me!" It cried, as it generated a giant windstorm. All four dismissed their monsters, and braced themselves against the wind. Yu was knocked down, and sent skidding across the ground, while the two girls were blown back a good distance. Headphones Boy stayed standing.
"Let's do this, Jiraiya!" He shouted, re-summoning his frog.
"You want more? Coming right up!" The Shadow shouted. Headphones Boy gave a cocky grin in reply.
"Dish out your worst! I'm never giving up!" He braced himself as another blast of wind came at him. Jiraiya managed to fly through the wind, and threw a hail of shuriken. The sword moved to parry them, but a lightning bolt hit the sword, and stunned the hand holding it.
That came from Yu, who was back on his feet. The shuriken hit the arm holding the staff, forcing it to drop it, and black ichor to leak from where it was wounded. "Why... Why are you doing this...?!" The Shadow cried out in pain as its ivory hand loosened its grip on the staff.
Tracksuit Girl and Cardigan Girl jumped on that chance, the former having her creature slice the staff into pieces which the latter set aflame. An oddly colored bear off to the side (how had she not seen it?) shouted, "It can't make its wind barrier anymore! Now's your chance to attack!"
Yu and Tracksuit Girl kept the sword hand busy. Their creatures charged forward, and forced another blade lock. When the Shadow shook one of them free, the other would engage it, keeping it from defending against the barrage of fire Cardigan Girl was dishing out. Headphones Boy was having Jiraiya launch gusts of wind forward, which fueled the fire and trapped it in a blazing inferno.
The attacks dissipated as the Shadow reverted to the form it was in before, severely exhausted, and worn down. "You could never understand! Why am I never enough?!"
Hoodie slowly climbed to her feet as she watched them fight. She saw how it had fought, the masculine and feminine sides working in harmony to keep the attackers at bay. Why couldn't she be more like that?
Who said she couldn't be like that?