A Combi-Micromaster combines with another Micromaster to form a larger robot. They seem to be the logical inversion of Micromaster Combiners, wherein two Micromasters combine when transforming to form a larger vehicle.

Combining in pairs to form a larger robot is part of the Multiforce's schtick, but that team was never identified by this name. Rook and Crosswise, who combine to form Mirror, are the only known Combi-Micromasters.

Fiction

TransTech

When Sideways became a finalist in Cybertron's Got Talent, an interpretive transforming competition, his double-Headmaster Combi-Micromaster companions gave him an edge. Andromeda - Axiom Nexus News Reporter

Notes

• Combi-Micromasters were mentioned in a UK Letters page,^[1] but up until 2015 no specific Transformers have ever been identified as such. The Multiforce were labeled as "Micromasters" with the 2004 reissue of their toys, retroactively making them candidates for the name.
• Energon Nightcruz and Nightscream, who form Nightcreeper, may also be Combi-Micromasters.

References