izuku is raised as a villain, but it doesn’t do anything to dampen his core personality; it just gives him a severely skewed perspective on what is and isn’t normal, and instead of becoming a neutral good, he is full on chaotic neutral.
katsuki discovers izuku gallivanting around the city, ten years after he went missing, and he is so furious he drags him to the police immediately. izuku thrives on chaos and trouble, so he goes along with it to see what happens. it works as well as you might expect. izuku has so much fun / is so curious he comes to see katsuki again.
he chooses to do this by climbing into the window of katsuki’s classroom. which also happens to be in yuuei.
tl;dr izuku is immensely entertained by everyone and everything; the teachers are in an uproar, but can’t manage to catch him long enough to get the law to deal with him; and class 1-a, with their proclivity for trouble, acquire a new pet project.
here’s part of a thing i wrote while thinking about it:
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“No code of honor?” Deku looks offended. “Of course I have a code!”
“Not to burst your bubble or anything,” Kirishima says, “but your immediate suggestion for dealing with this situation was knocking out the enemy, looting them, and stripping them of most of their clothes.”
“Most people lose the will to fight when they also lose their clothes,” Deku explains.
“That’s – beside the point,” Iida says. “We must conduct ourselves with honor! There are lines we do not cross, and must not ever cross! You must find yours!”
“I have lines I don’t cross,” Deku says indignantly.
“Really? Like what?” Kaminari asks.
Deku thinks for a moment, and then he holds up a finger. “Always be polite to everyone.” A second finger goes up. “Always tip your server. And…” He holds up a third finger with great emphasis.
Everyone waits with bated breath.
“This is harder than I thought,” Deku says. “How do you guys live with all these rules?”