Predacon counterpart to Maximal Eggbot is Dark Eggbot. Identical in design but cast in a smoky black plastic rather than blue, Dark Eggbot turns into a mechanical sphere keychain, where he presumably keeps keys used only for evil purposes. Dark Eggbot was available in Japan in 1998.
The combined form of the Universe Micromaster Aerialbots is Superion, an amalgamation of six robots plus their pack-in accessories that serve as connectors, head, and extremities of the gestalt warrior. While in Japan, the original source of the design ( Sixwing , 1992) was available in a collected set, this combiner needed to be purchased one bot at a time in the 2007 Universe release.
