Disclaimer: I do not own My Hero Academia.

Summary:

Katsuki Bakugo learned a valuable lesson the day Izuku got his quirk. Even though he was diagnosed as quirkless, no one believed him. He somehow, was able to always have something with him that no one was able to figure out where it could come from. As he grew to accept his odd friend he decided it would be best to make a list of do's and do nots. By the time middle school was about to end he had a list of don'ts and a mandatory do.

Do not, under any circumstances:

1. Do not bad mouth Inko Midoriya.

Note: No one knew why the teacher, in elementary, who had done so 'moved away' the next day. The substitute who talked to the class that day was highly nervous. A couple of bullies also went to the hospital in kindergarten after they made a bad joke. As far as he knew they were still in a coma.

2. Never insult katsudon. He loves it.

Note: Those that argued were humiliated. He remembered where the rubber chicken went. A dodge ball should not fit where it did. That many ants should not fit in a kids pants. The pencil should not have been a replicated balloon look alike. The chalk should not have become paint.

He was the only one that could survive insulting it. Even then, he would gain a warning.

3. Do not ever mention 'quirks' and 'I wonder' in the same sentence and conversing with Izuku.

Note: He will mumble. He shall write. He zones out and no one can comprehend his coded writing or speech.

4. Do not interrupt Izuku's quirk research unless you have Katsudon. Then you will be forgiven.

Note: Those that had, had disappeared for three days had needed therapy. They also never told what happened except for a repeated mantra of 'Never interrupt, I don't want to be researched, bring katsudon'. They appeared in the local news.

5. Do not insult dead or injured heroes.

Note: They went missing. They were also labeled as cold cases.

6. Do not insult his favorite hero All Might.

Note: He will humiliate you, your friends, and family with no way to trace it back. Victims have tried. It only got worse.

7. Never, under any circumstances, do you make Izuku mad.

You thought the above were tame? Have mecy upon your soul. He will do anything above or simply give you a lecture. You don't want that. This is all speculation. I Katsuki Bakugo have not seen him mad before.

8. If Izuku seems aggravated and tired: Do not do anything to provoke.

Note: Keep Izuku happy.

9: Do not insult his intelligence.

Note: He let out an evil laugh that creeped out everyone in the area at the time. Police were called. He spoke to them. He started to write in his note pad and got someone locked up for the ideas of his quirk usage the person that insulted him was capable of.

Extra note: Unsure what will happen to villains or heroes when he meets them.

10: Do not ever give him more than a two pieces of candy.

Note: Sugar high lasts twenty-four hours. Impossable to catch. He defies physics and laws of gravity during this time. The only person able to stop the madness that is the green haired Midoriya Izuku is his mother and possibly All Migh. More knowledge needed.

Warning Note: If his reaction to sugar is bad, coffee may be worst.

These were the things he protected others from. He had to keep him in line. He was already a hero. A majority of people looked down upon the quirkless, but he was Izuku's guard. The reason why? He was a confirmed best friend. He would survive whatever Izuku did.