The majority of Runes are Elemental based unless otherwise.
How about having an Unique Rune (Falcon Rune) which allows you to attack at a blinding speed in a flurry of attacks and an Earth Rune? That basically covers (full party protection) and individual immunity to rune magic for an attack.
After consideration, I've also decided to allow Signature Runes. The true unique to said character Runes.
That goes from Basic/Advanced Runes, Unique Runes, and Signature Runes.
In honesty, I have no idea why Unique Runes are called that. They're unique I suppose, but a lot are the same. Probably because they're brought through heredity.
Signature Runes are only specific types of Runes, much like True Runes, only exist on one person or place at a time. Meaning, no one else can get them. As for how they come to be, it isn't really said. Perhaps the power of the Runes form in this specific person as a spark of greatness.
As only the 108 Stars of Destiny or major villains have possessed Signature Runes (Like Yuber for example.)
Also, this game isn't a sexual orientated game, BUT, it is allowed and not discouraged if the players wish to pursue one another.