Action and other shtuff

Koro-sensei can travel at speeds up to Mach 20 is believed to have blown up the moon and is threatening to blow up the earth if he is not allowed to teach class 3-E and the class is charged with killing their teacher before the time limit. He is a very good teacher who inspires and helps all the students and gets extremely angry when his students are in trouble. The class and their teacher go through many troubles and even try to find a way to save their beloved koro sensei 10 million stars T^T

the mc is reborn into the body of a normal citizen who makes his living in assisting hunters. he uses his knowledge to quickly gain fame and power and quickly becomes too powerful for anyone hunter or not to beat him.

Gon a boy who’s father is a hunter sets out to take the hunter exam to become a hunter he stumbles upon friends along the way and somehow with his stubbornness, courage and smarts him and his friends except for one become hunters. Killua the boy who didn’t make it due to killing one of the participants which was against the rules goes home. Then gon goes to find him and killua stays with gon for a while to protect him. So the friends go on tons of adventures together.

A world where ajins humans who cannot die and also have strange shadows that they can summon to attack or spy are very rare. A boy discovers he is one after getting hit by a truck goes on the run and finds fellow ajins but some of them are very bad people can he survive in this chaotic world and defeat the evil?