Justice League Cyborg is added in the 1.8.0 update. His shards can be obtained in Arena battles - he may randomly "invade" a battle, replacing one of the characters. If you succeed in beating the match, you will obtain a few shards and a piece of his gear. You can obtain rewards 3 times a day.
Cyber Strike drains 3 Power Bars, increasing by 0.03 per level.