Creating new topology in ZBrush is now easier than ever. With ZRetopo you can extrude edges and move points along the surface of another object. It's now faster and easier to retopo an entire character using ZRetopo in conjuction with MultiTopo, an IMM brush with 14 different meshes using different topology flow. The great thing about MultiTopo is that it instantly projects the new mesh along the surface of the object. Just choose whatever mesh fits your needs, drag and drop it on the object and it's done.

ZRetopo and MultiTopo in action: https://youtu.be/GmIU9hhzs74 https://youtu.be/-x28LbQ5q50

These brushes work only with ZBrush 2021.5 and all the future releases.