Sounds a little like Jesus.

M = 13th letter of the Alpha-Beth. 12 apostles makes Jesus number 13?
M could also be for Messiah?
The question mark could fill in for a "G" / Widow's Son?

Aliases Kenny McCormick
Gender Male
Race Caucasian
Hair Blonde
Age 10
Birthday March 22
Occupation Superhero
Voiced by Matt Stone

Notice the birthday: March 22 / 322 / [link to en.wikipedia.org] / Widow's Son
Also Georgia Guidestones Erected 3/22/1980 Ala RC Christian / Rosy Croix / Rosicrucians

The original meaning of "322" is Genesis 3:22...

"And the LORD God said, Behold, the man is become as one of us, to know good and evil: and now, lest he put forth his hand, and take also of the tree of life, and eat, and live for ever"...

Thread: The Secret Of Number 322 - Genesis 3:22 Revelation 3:22

[link to southpark.wikia.com]

Mysterion is the embodiment of the anti-hero character archetype. Much of his attitude and view of the world stems from his experiences as Kenny, from his poverty, his willingness to help others in a time of need, as well as his inability to convince his friends of his inability to stay dead, which he views as a curse. Most of the time he is calm and calculating, making him an excellent strategist. However, there are times when, usually when people fail to take him seriously or in discussions with the Coon, that his temper gets the better of him - he came very close to lashing out violently at Kyle when he said that not being able to die would be "pretty cool". On another occasion he said that he finds pissing Cartman off "extremely funny" - possibly the only time Mysterion has laughed. He also displays a different persona than his real-life self, coming off as more gruff, intense, authoritative and grounded, whereas Kenny (usually) tends to be more lighthearted, easily amused and annoyed, also tending to play more of a supporting role with his friends.
Despite being the near-exact opposite of the Coon, Kenny has used his alter ego to improve his own life to an extent - he convinced his parents to stop beating each other up and abusing their kids, stop doing drugs (although he has only been semi-successful with both of these demands) and give their children allowances.

"I’m an angel keeping watch over the city at night. As violence and darkness take over the streets, I work to rid the city of crime. I’m the symbol this town needs."