These are different Sky children throughout the Dimensions series.

Dimension 1 is Ryan(Sketo child)

Dimension 2 is Skymu child Eclipse.

Dimension 4 is Skylox of Child

Dimension 6 is Skyrome

Dimension 8 is EnderSky

Dimension 10 is Skythan

Dimension 12 is SkyBrine (HeroSky)