Shadow Striker and Roulette were a two-pack available as a convention exclusive in 2003 from the Official Transformers Collectors Club. Convention exclusives are typically redecos of existing designs -- in this case, it was Side Burn from Robots in Disguise -- but these toys have a brand new sculpted head, making them distinct female characters who happen to be sisters. Shadow Striker is the one on the left. Roulette is on the right. They both turn into Dodge Vipers with exposed engine blocks.
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.
