We're with the robed folks.

"His progress is astounding"

The black robed guy has the blue gem.

"So what happened?"

He puts the gem into the munny pouch.

"Namine's encounter with Roxas put his heart in Kairi's and in turn that affected Sora. see?"

"Namine - she's a wonder"

"She wasn't born like other nobodies."

"She can interfere with the hearts and memories of Sora."

"But whose nobody is she?"

"I could tell you."

"But first perhaps you could tell me your true name."

He reveals himself. "It's Ansem."

The red guy laughs. "It's an honor, Ansem."

Kingdom Hearts 2 Walkthrough