Century Baby are individuals born exactly at the "turn of the century", they as such possess metahuman abilities and longevity. It has been theorized that they act as an immune system or anti-bodies for the Earth, their very existence protecting Earth from upcoming threats, and sometimes represent and personify a certain aspect of the century's culture into which they are born.

List of Century Babies for the 20th Century:

1. Elijah Snow, the Ghost of the 20th Century
2. Kevin Sack, Lord Blackstock
3. Dr. Axel Brass
4. Bret Leather, the Dark Millionaire
5. Jenny Sparks, the Spirit of the 20th Century
6. Hark
7. Addie Vochs / Vox Populi

* Jakita Wagner and Anna Hark are also noteworthy, as they received special abilities and increased lifespans as the children of Century Babies.

List of Century Babies for the 21st Century:

1. Jenny Quantum
2. Jenny Fractal
3. River Baldwin
4. Gaia Rothstein
5. Jenny Soul
6. Jenny Crisis

List of previous Century Babies (iterations of the Spirt of the Century):

1. Jenny Steam, the Spirit of the 19th Century
2. Jenny Revolution
3. Jenny Crusade
4. Jenny Inquisition
5. Jenny Plague
6. Jenny Ra
7. Jenny Fire
8. Jenny Stone