Monica

''"You abandoned me for... for that bitch!" ''Monica berates Zach for working with VCYSTEMS rival, Kadi

Monica is an Angean, and one of the last two left of her type. During The 15 Keys Rising she was made into a cyborg through the removal of 80% of her body below her chin

The 15 Keys Rising:
Monica is present in the first chapter alongside Zach working for VCYSTEMS, however vanishes soon after Zach's mission.

Powers
Before her upgrade Monica had yet to gain her Angean abilities like Zach had, but instead had them forcefully locked away from her when she became a cyborg. Her cybernetic implants grant her multiple abilities such as:

Muscle Stimulation:
Monica can use her FC infused blood to stimulate her own muscles, causing them to become more durable and grant her an immunity to pain.

Super-Human Strength:

 * Monica is able to carry immense weight, holding back Zachs weapons despite his increased strength.