From Halopedia, the Halo wiki

Unmutuals are male Yanme'e who suffer from one (or possibly more) rare personality disorder(s), rendering the affected creatures incapable of functioning as a single, coherent low-grade hive-mind. This deficiency causes significant problems within their rigid, socialized species, ultimately leading to psychopathic behavior. Unmutuals brutally attack other Yanme'e, sometimes with little provocation, and even destroy eggs. These individuals are considered outcasts, banished from their hives, and often find refuge in small cavernous spaces between hive territories. Following their species' integration into the Covenant, the number of unmutuals began to increase significantly. As a result, the Covenant sentenced unmutuals to work as slaves in penal work colonies operated by the Kig-Yar, where they are worked to death and often tortured. Despite their violent and unpredictable natures, some unmutuals exhibit remarkable cleverness and intelligence.[1][2]

One such penal colony was transferred to Verge, where they worked to maintain the local beacon with a constant supply of helium-3. They were accidentally freed by Team Black, tricked by a lone individual who offered an alliance between the Yanme'e and the UNSC. While many of these Yanme'e were killed by the destruction of the beacon by Black-Two, there may have been survivors.[1]

The term "unmutuals" is an inexact translation from the original Yanme'e word. Another descriptive term is "incapable of socialization."

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