I think they have meanings too (theres also background btw)So I'm pretty (or I hope to be) sure that the symbols in the backgrounds aren't there just for aesthetic purposes, so I'm taking a jab at these.
From my 5 min of googling, those runic symbols may represent :
>ᛗ mannaz (man, human)
>ᚨ ansuz (god)
>ᚱ raido (ride or journey)
Then you have some diamonds here and there and dots which I assume to be stars.
Does that mean she's a demi god of travel ? the female nordic version of hermes ? I'm still bothered by the + and = she has in there.
last one, a ribbon
This has a bear(?) , Saya has swords etc.
Edit: In fact all of them have 3 symbol silhouettes