Anagrams

-Same letters in name
-Associated with color red
-Live in a place of extreme temperature

plus he also knows everyone

O_O

Well you see, Satan is Santa's older brother. The parents were just too lazy and decided "Hey! Let's make the younger brothers name an anagram of Satan!" Of course, Satan had issues growing up so he became super unholy and ended up where he is now. Santa, on the other hand, was a perfect child

>:)