Thirteen

No. 13 is a Hero in Boku no Hero Academia.

Appearance
No. 13 is a large man with his physical appearance unknown due to his hero costume covering his whole body.

No. 13 hero costume consists of a space suit, a helmet, and boots.

Rescue Trial Arc
No. 13 makes his debut at the Ultimate Space and Jams, an area which he said he created that would allow all kinds of disasters and accidents to be simulated. Shouta asks where All Miight is and No. 13 replies that he was doing his job as a hero and was told by him that he could not make it as he was taking a nap. Before the rescue trial could begin, No. 13 makes a speech about the dangers of Quirks being used to accidently kill people and how Quirks have been regulated and their requirements for usage strictly enfored by the society of superhumans humans. He tells the students to be wary of their Quirks and then tells them that their lesson will be about wielding their Quirks for the sake of human life. No. 13 ends his speech by saying he hopes that everyone will fully understand that their Quirks exist to help people at the end of the exercise and then thanks everyone for listening with Izuku, Ochako and Tenya applauding him. However, before the exercise could begin, the villains show up, causing Shouta to command No. 13 to protect the students.

Quirk
"Black Hole": No. 13's Quirk creates a vortex that sucks anything in, and crushes anything into the dust that gets sucked in.