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M. gui was a small dinosaur with a relatively short trunk legth (44-50% of hindlimb length), the tail had relatively few vertebrae (appr. 26) The sternum is a single flat and large bone, it differs from the condition in other dromeosaurids where two unfused sternal plates are present. The pes with the slender, strongly curved claws is similar to that of M. zhaoianus. The pubis is strongly curved (120o) . Another distinctive feature of M. gui is the bowed tibia whereas in most theropods, it is straight.

The integumentation of M. gui is based on the holtype and refered specimen and displays two types plumulaceous and pennaceous feathers with a length of appr. 25 to 30 mm. In IVPP 13352 the skull feathers probaly used for display are up to 40 mm long and even longer in TNP00996. To the distal tail, forelimbs en hindlims show large pennaceous feathers are attached. The patterns of the wing feathers are similar to those of modern birds.

Specimen IVPP V13352 is studied carefully under a microscope and a CT scan was made also to test the authenticity of the specimens.

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