Red haired, freckled faced, and light skinned youths. They have no soul, must stay away from sun, are creepy, and... in the middle of the night, will come to get you. The gene is recessive, and can remain dormant until adolescence. Stay away from ginger kids.
In the 9th season of South Park, Eric became what he despised: a ginger kid. He then became the leader of the ginger kids supremacist group, whose main intent was to exterminate all non-gingers.