Clint Barton

In the early Avengers comics, Clint Barton sheds his Hawkeye identity to become the original Goliath. As Goliath, he used Pym Particles to grow in size. In “Endgame”, he is the first Avenger to test the Pym Particles - a nod to his comics history. Bill Foster (featured in Ant-Man and the Wasp (2018)) later became the second Goliath.