Red John's "signature"; its eyes imply an epicanthal fold. When Caucasians draw a "happy face" it doesn't look like that. I'd be interested to see if that was a valid cultural difference, or just me making silly inferences. Hehe. He's also named after a serial killer (Scott Lee Kimball); AND Cho as a name has a legend behind it about a miraculous baby being born with the red Chinese (sic) symbol for "Cho" written under his arm. .

Easy.