Not necessarily just alternate versions of existing characters, but also characters that are specific to alternate dimensions and/or timelines.

Nicole Lasaron (Dimension 16)

The Dimension 16, or Star Fusion Dimension, counterpart of Nicole.

Nicole Lasaron (Dimension 408)
The Dimension 408 counterpart of Nicole.

Nick Lasaron
The Dimension 63 counterpart of Nicole.

Athena McWilliams
The girlfriend of Nick.