Kasumi and Haruki Hisakawa, the Tickle Twins, are adult siblings who hide a dark nature beneath playful, childlike behavior. Speaking only to each other, they ignore their victims completely, focusing instead on striking in flawless unison. Their synchronized assaults overwhelm weak points until resistance collapses, leaving no escape. Though they seem mischievous and carefree, their loyalty to Chaos Hunter and the Foundation is absolute.