There are a bunch of A Wyatt Mann's cartoons up on resist.com, the website of the White Aryan Resistance. Not linking it, you can look it up yourself if you want to.
According to Encyclopedia Dramatica, his real name is Wyatt Kaldenberg.
Kaldenberg is definitely a real person and was active in the white nationalist movement in the past, but has now left it. Not because he stopped being a racist, mind you, but because he thinks all the White Nationalist/Nazi stuff doesn't help the average white Joe who is being attacked by liberals and the lesser races and such.
He now writes books
promoting Odinism and
attacking the racist movement. Which is an improvement over his cartooning, at least.