She is revealed to be a beautiful, stern looking young woman wearing a full knights armour and wielding a huge lance.
Arianrhod is skilled in every school of martial arts, possesses a strict moral code, and shows no mercy to her enemies.
- She commands her own cavalry forces called the Stahlritter (鉄機隊 Tekkitai?), with Duvalie as its captain.
- She makes a non-cameo appearance in The Legend of Heroes: Trails of Cold Steel.
- Rumor is she is claimed to be the legendary "Valkyrie" of the Erebonian Empire, who used to lead the Empire's elite cavalry forces into battle. If the rumors were true, it would mean she has lived for over 200 years. Celine doubts this, however, by saying that she isn't St. Sandlot (while wishing that she were) in Trails of Cold Steel after Arianrhod assists Class VII.
- Arianrhod is named after a goddess from Celtic Mythology who's name means "Silver Wheel".
- Her powers are described by the characters of Ao no Kiseki as transcending that which is humanly possible, something on the level only the Divine Blade could hope to touch.
- Defeating her in battle in Ao no Kiseki results in her commenting that the protagonists have the potential to one day reach the level of the Divine Blade.