
Later, other robots with symmetrical combinations are introduced, making a total of three sets of twin robots (four brothers and two sisters) - the new brothers who appear later are Fu Ryu (Wind Dragon) & Rai Ryu (Thunder Dragon), and their Symmetrical-Docked form is Geki Ryu Jin (Fury Dragon God - a Dragon God whose forte is offensive).
The idea of two robots that can use fire and ice to attack and can also become a symmetrically-formed combined state isn't new to Takara - in The King Of Braves GaoGaiGar, the last of the Brave Series, Hyo Ryu (Ice Dragon) and En Ryu (Fire Dragon) fit this description too, performing the process Symmetrical Docking to assume their unified state, Cho Ryu Jin (Super Dragon God - a Dragon God whose forte is rescues). A home theater with a large TV screen where Bruce and Dick watch movies. The caverns below the mansion hold the Dark Knight's secret headquarters, the Batcave. Apart from the secret entrance behind the grandfather clock, the Batcave could also be accessed via an elevator hidden behind a book cabinet. The mansion is a fully equipped home with a kitchen, gym, multiple bedrooms, servants quarters, a full library, vast collections of antiques ranging from firearms to paintings, and even a Ming vase prior to it being accidentally destroyed by Alfred, a multi-car garage and a study which contains the secret entrance to the Batcave.
Numerous social events, including a fundraiser for Harvey Dent's re-election campaign were held there. In addition to being a private home it has also, from time to time, been a centre of activity for Gotham City's elite.
The manor was built on a cliff overlooking the ocean. The estate has long been the ancestral home to the Wayne family.