SiSi
She heard Gsp exclaim, "Hope, I challenge you to a lightsaber battle!" Gsp sounded extremely far away, as SiSi was drifting in and out of consciousness. She frowned and thought about when to reveal...it. That's right...it isn't worth it anymore, not now that I've got 2 huge bumps on my head, she thought.
As she stood up, the Boss came in. "I heard the sounds of raised voices and several explosions," he glared at everyone else in the room. Then, seeing SiSi, he tensed. "Well?! What happened? Don't just stand there like an idiot!"
SiSi did not immediately respond. She was fighting the urge to spew out all the bad words she knew; instead, she vented her fury on the Boss by karate-chopping him on his head, just like she had with Hope, except with 5 times the power. He immediately crashed to the floor.
SiSi straightened up and sighed. "Thank goodness...I've finally gotten that over with!" The YWS-ers in the room were all staring, astonished, at her. Finally, Mira asked, "So you were just faking it the whole time?!" SiSi nodded. "Believe me, it was for your good, not to hurt you or anything. If you hadn't had a bad guy stationed here, well...how would you guys've gathered all the info you needed?"
"For example...?" Irish trailed off, still raw from the deception played against her.
"I thought you'd say that. You don't know one-sixth of all the things going on here in the HQ; that's how secretive everyone is about this place and our works. I can tell you that we spent years planning this event meticulously, always scouring the YWS world for more bits and pieces of information about you guys...especially your weaknesses."
"Then how did you avoid being recognized to be on the good side?" Gsp was very puzzled.
SiSi grinned. "I think that's a story for another time, when we're all safe and out of here."
"Well, you can let that dream die and sink to the floor, Miss SiSi," said a voice from the doorway.
It was Skeyeler.

* Hello, the only thing I would like to tell you is: You will rue this day! Mwahahhahahahah!! Rue it I tell you!