Pictured here in this drawing from 2019 is Victory Saber, the combined forms of Victory Leo and Star Saber. These toys were available separately in Japan in 1989, or as a gift set that made combining them that much easier. In addition to their robot modes merging, their alternate modes also combine to form a giant space cruiser.
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.
