"Damn, that... that was actually pretty cool. Nice... introduction phrase." (y/n); who had become the voice in her own body's head, said. Mikoe, who had taken full control of (y/n)'s body rolled her eyes. "Also, how exactly did you do that?"
"Possession. Before I died my quirk heavily revolved around the manipulation of souls and ghosts." Mikoe answered, she glared in the direction Julia had flown, anticipating her return.
"Wait... you're dead?"
"My body is. My soul clearly isn't."
"I'm so confused."
"Don't bother trying to understand something you're incapable of understanding." Mikoe retorted as she positioned (y/n)'s body into a defensive stance.
"INCAP- EXCUSE YOU-" (y/n)'s screeching was interrupted by a searing pain in her stomach. Julia had used a strength increasing quirk to knee (y/n) in the stomach. While (y/n) felt the pain entirely, Mikoe merely seemed to flinch, immediately switching from her crouched over position into a casual stance, as if she wasn't experiencing any of the pain.
"This isn't making sense..." (y/n) muttered trying to ignore the pain.
"My quirk doesn't make sense to many people, so I'm not going to bother explaining how it works mid battle." Mikoe quickly responded. Julia launched into the air, aiming to punch (y/n)'s face, but Mikoe managed to catch Julia's fist, lifting Julia off of the ground, spinning her around for good measure, and then slamming her down back onto the ground.
"How odd. Have you held back your true power this whole time? It's like I'm fighting an entirely different person..." Julia pondered after she pushed herself off the ground.
"I feel kind of offended."
"You definitely aren't as fun now though. Those interesting combination attacks were interesting to witness. Now you seem... bland..." Julia muttered.
"I'm not here for your entertainment. I only have one goal. To put an end to you." Mikoe responded as she launched herself at Julia, her fist igniting with a brilliant flame.
"End me? Were you planning on doing that with your underdeveloped quirk?" Julia scoffed as she swiftly raised her hand to create a barrier made of water, which easily extinguished the flames Mikoe had created.
"WHOSE QUIRK ARE YOU CALLING UNDERDEVELOPED YOU WITCH-"
"Shut up. You're giving me a headache." Mikoe grumbled.
"YEAH! YOU TELL THAT WIT-"
"I meant you, you incompetent fool."
"Ouch."
"Ouch? Did I hurt your feelings?" Mikoe hissed sarcastically as Julia used her quirk to have roots break through the ground and attempt to capture Mikoe. In return, Mikoe used (y/n)'s quirk to create a sword to slice any roots that had managed to get too close.
"You know, you could try being a little nicer... just saying"
"I've been using you as a vessel, so that when the time came I would be able to find and kill this monster." Mikoe muttered coldly. In one swift movement, Mikoe aimed her sword at Julia's face and threw it at Julia with ease. Julia easily used the roots to wrap around the sword and destroy it. While Julia had been distracted with the sword, Mikoe had activated an ice quirk, and froze the vines. She kicked a frozen vine, causing it to shatter into a small icicles. The shards of ice all hovered in the air, awaiting commands from Mikoe. When Julia lunged towards (y/n)'s body, Mikoe pointed at Julia, and the icicles launched towards her, aiming at her heart. Julia countered the icicles by firing flames at the icicles. Once the fire and ice clashed, large amounts of smoke were released, providing a sufficient smoke screen for both sides. On one side, Mikoe was using the smoke screen to hide the fact that she had morphed into a snake. While Julia, had simply remained still, amusement evident on her face. She didn't feel threatened at all.

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Project: Master [BNHA/ My Hero Academia x reader]
FanfictionMaster; a quirk, a very strong quirk. This is the only quirk that was unbeatable, for the owner of this quirk had access to any quirk they know of. Master is a quirk passed down from generation to generation, and the current holder was Julia (L/N)...