Well, because there won't be any Virtue meddling in Envy's chapter, I'll chronicle all their cameos thus far:
Chapter 2:
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"Are we ready?" She asked.
"Yup, and I'd like to get out of here," Gluttony said. "Being near wasted food makes me sad."
"Of course it does," Pride sniffed. "Are we ready?" The rest of the girls nodded, and Pride bowed her head briefly, the others following suit. In a brief moment, a boquet of flames blossomed from their feet, nearly instantly engulfing them and burning out just as quickly, leaving nothing but a faint smell of sulfur and brimstone behind. A jogger paused as she passed by the alley, curiously sniffing the lingering stench before turning and continuing on her jog, the miraculous teleportation otherwise unnoticed.
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A jogger sniffing suspiciously at sulfur?
http://spiralingstaircase.deviantart...arol-111841374
Chapter 6:
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"Dude, did you see the size of that cop back there?" He asked, turning to Sid.
"What?" Sid asked, stopping and turning around. The police officer Kevin was referring to was rather easy to spot, even with their back to them. Close to seven feet, they towered over most of the other chinatown residents, broad shoulders and bulging muscles barely-constrained in a blue uniform.
"Good grief," Was all Sid could come up with.
"Friggin' Alcatraz in a hat," Kevin said, shaking his head.
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Enormous musclebound person scanning the rooftops for vices in a blue outfit?
http://spiralingstaircase.deviantart...onna-112505691
And of course, Chapter 8 has Janet interacting directly with Sid for the first time:
http://spiralingstaircase.deviantart...anet-155533844