Sera was one of four Invid Simulagents created in humanoid form by the Invid Regess. As the Crown Princess of the Invid Race, she and her brother Corg, shared command of Invid Legions, and they were both given Invid Commander mecha to fly in battle.
With Corg, she fought Lieutenant Scott Bernard's freedom fighters. Being now in a humanoid form, she was also exposed to human emotions.
Like her sister Ariel, she fell in love with one of the human resistance fighters named Lancer (aka Lance Belmont). Together, they convinced the Invid Regess that further war would bring the destruction of both races, ultimately siding with the humans. Thus, when the Invid Regess and the rest of the Invid transcended their corporeal forms and left the earth, both Sera and Ariel were left behind.
No mention of Sera was made in the 2006 animated sequel Robotech: The Shadow Chronicles. Although, the first part of the film covers most of the same events of the last two episodes of the 1985 series, she was omitted along with all of the other supporting characters of the Mospeada/Robotech:New Generation segment.
Sera's counterpart in Genesis Climber Mospeada was named Sorji (ソルジ).
Read more about this topic: List Of Robotech Characters, The Third Generation