Disclaimer: I don't own My Hero Academia or Undertale

Authors note: Thank you for all the reviews everybody!

Rule Five: To win a battle, gain knowledge. Side note: Knowledge is power.

"Why can't I tell anyone about what you can do Deku?" Katsuki crossed his arms.

"I'll tell Auntie that you bully others, that you complain about her spicy food not being hot enough, and that you broke one of my limited edition All Might figurines when I brought one to school."

"Eh, I don't bully people!"

"Yes you do, and you know Aunt Mitsuki would believe me."

"I don't complain about the old hags food!"

Izuku nodded. "Yeah. You don't. I'll just tell her that you called her an old hag."

"You didn't bring your All Might doll today?" Katsuki was starting to pale.

"No, but I can bring it right now and no one besides you would know what I could do. No one would believe you." Izuku shrugged his shoulders.

"You're really not fair Deku." Katsuki pouted and turned away from him.

"Yeah, but I have to be careful."

"So, what can you do?"

"I can learn what bad things people have done..."

"Oh. So are you going to take notes on your old man?"

"You know what? That's a good idea!"

Izuku beamed at his friend.

"What kind of notes should I do?"

"Well, teacher did say something about habitats and habits or something like that."

Izuku nodded. "Hmm. You've got a point."

Hisashi Midoriya

Age: 37

Wife: Inko Midoriya age 33

Son: Izuku Midoriya age 6

Height: xxx

Weight:xxx

Eye color: Black

Hair Color: Black

Mutations: Sharper than normal nails on hands and feet along with incisors. Ears are also longer and angled to a point.

Likes:

Food: Inko Midoriya's cooking. Prefers Katsudon and Miso soup for lunch and dinner meals. Prefers American breakfasts with bacon, sausage, and eggs. Fish are not preferred. Asks for oil instead of butter if available for cooking. Has a tendency to ask for Wine or other alcoholic beverages every other couples of days and is irregular in his asking. Usually asks when it is a late dinner to help him go to sleep easier. Water is his main source of drink. Hates juice as it is to sweet. Does not like sweets. Prefers spicy or rich in taste food. Likes dishes that has a cream sauce.

Whatever: Likes the smell of lit candles. Favorite color is orange-red. Appreciates fancy clothes.

Habitat: Was overseas. Research in moms purse and food that is requested indicates an American lifestyle. Unknown work as he doesn't discuss at dinner table. Apparently not acceptable for dinner table discussion. Government? Villain? Mercenary? Something with secrets.

Habits: When something is too spicy or it is too hot outside, coughs out puffs of fire. Blinks rapidly in stare contests. For some reason always looks away from me when Quirk is activated. Seems to try and avoid me. Likes to hug Inko Midoriya. Left eyebrow twitches when annoyed or angry. Uses Quirk to light candles to relax.

"Izuku? What are you doing?" Asked Inko from behind him. Izuku's pencil tip broke as he jerked up from his position. He was hunched over a notebook.

The boy smiled warmly at his mom. "Oh! I'm writing about daddy!"

"Really? That's amazing! Do you want me to call your father and have him help you?"

"Sure! This is so that I can tell everyone about him at school for show and tell!"

A few minutes later Hisashi Midoriya was talking to his only child about himself. Thirty minutes into the discussion, Hisashi thought he was being interrogated by his own son. An hour after that made Hisashi think that the questions would never end and that he should probably have his fifth glass of water within an hour and a half when Izuku set down his pencil, closed the notebook and clapped.

A sincere "Thank you," to the man had Hisashi rethink his thought process of his child being a evil mastermind and that there was no way at child of his could ever have bad intentions as Inko explained to him one day that "Izuku couldn't even harm a fly."

The next day Izuku "Deku" Midoriya showed the book to Katsuki Bakugou.

Katsuki paled as he saw the notes. Katsuki knew it wasn't normal for a kid to write small and neatly or to fill a full hundred page notebook using both sides of the paper. No one should have that much information with the amount of time Izuku had with his idea.

Katsuki's own mother and father complained about paperwork and how long it took to sign papers.

Katsuki paled further as his crimson eyes looked between Izuku and the notebook.

One thought rang through the child's head.

What have I done to Deku?

The child wept in his mind.