Mythology
The Norse had beliefs about Rasmus, now long-lost to time. It was thought that a Ragnarök-like event had “reset” the cosmos, and that he was a deity reincarnated as a human. Golden-haired, gentle, and having been born in a sacred grove dedicated to the slain god, Rasmus bore a likeness to Baldr (or Balðraz in proto-German), the beloved god of peace, joy, beauty, and the summer sun whose tragic death triggered the very same Ragnarök.
Baldr, a son of Oðin, was not just adored by his peers — his mother, Frigg, saw to it that he would never meet harm by begging all living creatures to take an oath that they would never hurt him. Frigg neglected to request an oath from mistletoe, and out of jealousy, Loki one day convinced Baldr’s blind brother to shoot an arrow laced with mistletoe at him. Baldr perished in front of all the gods, who were so distraught that a terrible winter befell the realm before the inevitable apocalyptic reset. Baldr’s fate was to return and inherit the new world.
This is all, of course, an open-ended interpretation. Very few traces of the beliefs revolving around Rasmus were recorded, and they are so vague that no one has realized they are about him. Needless to say, Ras doesn’t know any of this himself, as he was too young to understand and has forgotten a lot of his childhood anyways.
One thing is undeniable, though: he happens to be allergic to mistletoe.