User blog comment:Iamthelegion/Captain America vs Big Brother - Marvelous Rap Battles Premiere/@comment-29125272-20161004172638/@comment-4721185-20161004235838

Penance has the spikes in his suit to activate his powers

ryuko uses senketsu to drain her blood with needle thingies to increase her powers

basically they wear gimp suits to activate their powers (y)

also i suppose both are looking to avenge people, penance with the people injured in the Nitro incident, ryuko avenging her dad