Izuku Midoriya

Midoriya is the main character of My Hero Academia. He started in the story quirkless in middle school. One day he met All Might, the greatest hero and he gave him his quirk, the strongest power, but he could not handle it and had to undergo intense training but still could not handle it. After middle school his "friend" called him "Deku" as a word to show he is helpless, but he ended up using Deku as his offical hero name.

His Quirk allows him to go from 1% to 100% of One for All's power and produce devastating strikes and skills.

Quirk: One For All

Katsuki Bakugo

Bakugo (Kachann) is Izuku Midoriya's "friend" but also "antagonist" towards him. He tends to be rude a lot to his classmates, and very cocky and desperate. He always brags about his quirk and believes Midoriya will not become #1 but he will. 

His quirk allows him to create explosions from his sweat, turning it into ignited Nitroglycerin-like substance, and creating devistating explosions.

Quirk: Explosion

Shoto Todoroki

Todoroki is a close friend to Izuku Midoriya. He had do undergo a very abusive childhood as his dad sought him for being his successful son for the special quirk he has, containing 2 qurirks allowing him to control Ice from his right side and control Fire from his right side of his body. His father inherited the Fire Quirk giving him the power, and his mother inherited the Ice Quirk, giving it to him as well.

Quirk: Hot and Cold

Tenya Iida

Iida is a very close friend to Midoriya. He is the smartest of all the classmates in the class 1-A and is very serious about what his classmates do. 

His quirk allows him to have jet turbine engines in his calfs and accelerate to extreme speeds, making it one of the fastest quirks in the world.

Quirk: Engine