Xenosaga Episode II Edit
In Episode II, each of its four components has a separate attack corresponding to an order of angels (Thrones, Seraphs, Cherubs, and Dominions). This is thought to be a reference to the four pilots of the G-Elements mecha in Xenogears (Tolone, Seraphita, Kelvena, Dominia).
Xenosaga Episode III Edit
Episode III allows the player to summon all three incarnations of Erde Kaiser, and even takes the Xenogears reference one step further in introducing Erde Kaiser Sigma, which looks extremely like G-Elements. Erde Kaiser Sigma can be fought at Pedea Island.
The name "Erde Kaiser" is German for "Earth-Ruler", or "Earth-Emperor."
- Erde Kaiser's design is a homage to the Sunrise "Brave Series" mecha shows, typified by hero mecha wih lion's head chestplates (the most recent example of which is The King of Braves GaoGaiGar).