One of the very rare female Decepticons, Esmeryl (エスメラル, e-su-me-ra-ru) is the wife of the Decepticon leader Deathsaurus. She presumably has a similar alternate mode, as her robot mode bears more than a passing resemblance to her husband's.
She's kinda weepy.
Esmeryl and Lyzack both show up to show the Autobots just what it is Deathsaurus and his crew have been fighting for all this time: their poor female counterparts and countless children back home. This spares the Decepticons' lives in the final battle between the two forces.