To answer Karl’s inquiry on their names.
The names are words taken from the Scandi and Germanic languages (Danish, Norwegian, Swedish, and German) which represents their character's traits.
E.g., Fri(eren) is loosely translated as "The Free" in Scandi or "The cold one" in German, Himmel is "The Sky" or “heaven”, Stark (or Stærk) is "The Strong", Flamme is "The Flame", Eisen is "The Iron", Heitel is "The Cheerful", and Fern can be translated as "The Detached" or “distant”.