Adrenaline

After Izuku's failed attempt at trying to save Bakugou in the sludge villain attack, he was taken by Stain and was asked if he wanted to be a hero of his own kind, or to put it simply a vigilante

He saw potential in the kid and that he posses the characteristics of a true hero.

He told him that this was his second chance and the only way the kid is going to achieve his dreams is by bending the rules.

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Dabi and Toga will be Izuku's best friends
(Dabi and Toga are vigilantes here)
Sassy Izuku
Still Quirkless Izuku
Badass Izuku
Vine/Meme references