First up, we have Blue Medusa, real name Amy Jenssen. She's augmented with neural implants giving her psionic powers, as well as a cybernetic arm. Her external spine contains the bioelectric cells required by her brain implants, as well as EMP shielding and systems which prevent her augmentations from frying her brain due to overload.
Next up is Teslahertz, real name Adam Lithgow. He's an augmented brute who can deliver high voltages through his cybernetic arms. He got himself a jet pack because he hates driving and thinks that the Paragon City transit system is unreliable.
Now for Dr. Sevchenko. He is a mad scientist specializing in cybernetics, and the arch nemesis to Blue Medusa and Teslahertz. His goons kidnapped both when they were young and performed inhumane experiments on them. Blue Medusa snapped and went on a rampage within the labs, allowing herself and Teslahertz to escape. Sevchenko, despite the setbacks of the past, continues his experiments to this day and hopes to supply Arachnos with cybernetically enhanced soldiers.