Shikamaru no doubt gave Chouji a short rundown on Masaomi prior to this, summarizing his faults with a poorly hidden fondness (he's a punk and an ass sometimes, but he's a good guy). If he knew what to expect out of this scenario, he'd be taking his time with it instead of standing out here already.

"So, uh. Intros." Once Chouji has made his way out of the room also, Shikamaru jerks a thumb to his roommate. "Like you've figured out, this is Masaomi. He's the person I'm closest to here."