What is Jesus the leader of?

Answer 1

Jesus is the head of the church. The church is called the body of Christ. All believers in the Lord Jesus are formed into what is known as the body of Christ, or the church. Just as a human body is a vehicle by which the person expresses himself, so the Body of Christ is that vehicle which He has on earth by which He chooses to express Himself to the world. And He is the head of that body. The head speaks of guidance, dictation, control.

Colossians 1:18 And He is the head of the body, the church, who is the beginning, the firstborn from the dead, that in all things He may have the preeminence.

Answer 2

The only time The Bible says Jesus leads anything is when it calls him a shepherd who leads his sheep. Revelation 7:17 says, "For the Lamb at the center of the throne will be their Shepherd; he will lead them to springs of Living Water. And God will wipe away every tear from their eyes."
Those who follow him are his sheep.