I was reading Willful Machines by Tim Floreen, and I'm convinced that the main character is a Levi cameo. Why? I'll tell you why.
The main character, Lee Fisher, is described as, "...a skinny guy with chunky black glasses and cropped black hair...dark hair and pale skin and serious face..."
But that's not the only thing! Lee is also gay (Johnny I swear this time I'm not reading because it's gay. I didn't even know that it was gay before I opened it. I'm only here for the plot; the gay is just a bonus. Please believe me). Plus, Lee's first name, which is Lee, is the sound of the first syllable in Levi's first name, which is Levi.
Illuminati confirmed bitches.