Surprisingly not everyone watches Southpark and gets the Daywalker reference. Sooooo...here it is.
According to www.urbandictionary.com "The Daywalker is a Ginger that does not burn in direct sunlight. Hated by true Gingers, the Daywalker can sustain extended periods in direct sunlight and even has traces of a soul. Because they are still part Ginger, freckles may or may not be present."
For a more detailed description: