What's Deku's Third Quirk?

Float: Deku's 3rd Quirk, which was originally wielded by All Might's master, Shimura Nana until Deku inherited it. It allows him to levitate and suspend himself in mid-air. Danger Sense: Deku's 4th quirk, which was originally wielded by Hikage Shinomori until Deku inherited it.

What is the 3rd quirk?

Fa Jin: The Quirk wielded by the third user. This Quirk allows the user to build up and store kinetic energy as they move, this energy can then be released as an explosive burst of speed and power.

What are the other 6 quirks of Deku?

When taking into account the anime and the manga, all of Deku's Quirks put together make for a very interesting ranking.