Red John is most likely a man He appears to be a Caucasian, and is a white person as described by HaleyRed John has an average height: Rosalind described him as "just under 6 feet tall"Red John has short straight hair (as described by Rosalind Harker)Red John either has or puts on an odd, high pitched and soft voiceRed John should be older than 30 years (since his murders date back to the 90's)

So it is obv dexter from another tv show.