YN Sans
When he's not using his quirk, both his eyes have white pupils and black scleras. When he activates his quirk, his left eye glows blue and has a blue after-trail. Also, this is his hero outfit.
Quirk: Blue Bones
Sans can create bones made of blue fire and throw them at his enemies, or stack them in front of him and make structures, like a shield or a staircase. He can also throw blue fireballs that don't burn people physically, but rather burn their soul and make them temporarily weaker. The bones, however, will burn people. He can fire blue lasers from "Gaster Blasters". His blood is also blue.
Likes: His friends, his classmates (well, most of them), puns, video games, and anime
Dislikes: Perverts, villains, people who hurt his friends, bullies, people who think they're better than others
Frisk Dreemur
Quirk: Determined Souls
Frisk has access to seven different power boosts. When she uses them, her eyes change color to the color of that soul. Also, I'm using pink instead of light blue for Patience, because it makes it easier.
Gold: Determination - Grants a small boost to all of her physical and mental abilities
Purple: Perseverance - A last resort, gives her a two minute burst of all of the souls' powers at once, but can have severe drawbacks if she uses it for more than two minutes
Green: Kindness - Gives her limited healing abilities, which she can use to heal herself or others. She can also use it to reduce someone's stress by touching them
Blue: Integrity - Massive defense boost (makes her tougher)
Orange: Bravery - Massive strength boost
Pink: Patience - Massive speed boost
Likes: YN, her friends, video games, anime, chocolate
Dislikes: Perverts, bullies, villains, people who hurt others
Also, Frisk is a Kuudere. If you don't know what that means, look it up. Basically she's very shy, doesn't talk much to anyone but Izuku and Sans, and doesn't usually show much emotion.
This is Frisk's hero outfit. I know it's Kris from Deltarune, but just pretend it's Frisk wearing it.
Both Sans and Frisk are living with Izuku and Inko, because they both ran away from their homes when they were younger.
I DON'T OWN UNDERTALE, MY HERO ACADEMIA, OR THE ART IN THIS STORY! ALL RIGHTS GO TO THEIR RESPECTIVE CREATORS!
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The Bad Time Hero (Male Reader x MHA)
ActionYN Sans grew up wanting to be a hero. With the help of his best friends Frisk and Izuku, he aims to go to UA and accomplish that goal. Sans Male OC x Frisk