The Emperor Brug is a large, orange coloured insectoid with a functional optical organ embedded into its white back. It seems capable of controlling or at least acting as a hive mind for the lesser Brugs, coalescing with them into the Brug Mass.
The Emperor Brug has appeared once in the series so far.
 Metroid: Other M
In Metroid: Other M, the Emperor Brug watches Platoon 07 and Samus Aran from above. After Lyle Smithsonian destroys a Brug, the Emperor proceeds to drop down and form with the swarm of Brugs the Brug Mass, acting as it's eye. After the body was weakened by the efforts of Samus and the others, the Emperor popped out and was consequently finished by Samus.
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