Jera is a member of the Jamahl, heading the organization's Mercenary Army, and the secondary antagonist of Juukou B-Fighter.
She is voiced by Keiko Konno, who previously voiced Galactic Empress Meadow in Chikyuu Sentai Fiveman. In her unmasked form she is portrayed by Shelley Sweeney.
At an unknown point in time, Jera slayed the monster known as the Black Dragon alongside her friend Barla. She was later recruited into the Jamahl, eventually becoming head of its Mercenary Army.
She accompanied the Jamahl army when they went to invade Earth and was sent by Emperor Gaohm to lead an attack alongside Schwartz and Gigaro to take over a research building and convert it into the Jamahl's Earth headquarters. Along the way, Jera and her forces kidnapped numerous humans to use as slaves for the Jamahl. Two of the humans they captured, Daisaku Katagiri and Rei Hayama, resisted after the Jamahl forces attempted to kill a little girl's pet bug, but both were easily put down by Jera's mercenary Saberizer and tied up to be executed. However, the wise bug sage Guru teamed up with the Earth Academia to combine the power of insects with human technology to create a weapon capable of fending off the attacking Jamahl, the B Commanders. After Takuya used his B-Commander to become Blue Beet, Daisaku and Rei were freed and given B-Commanders to become G-Stag and Reddle. Together, the three formed the B-Fighters and destroyed Jera's mercenary.
After Gaohm became increasingly frustrated with his commanders' continued failures to defeat the B-Fighters, Jera convinced Gigaro and Schwartz to work with her to modify her defeated mercenary Death Mult so he possessed powers from all three armies, resulting in him becoming Phantom Death Mult. After Phantom Death Mult was destroyed by the B-Fighters following a tough battle, Gaohm opted to give his three executives a final chance to prove themselves and sent each of them down to fight one of the B-Fighters. Jera faced off against Blue Beet and, after a tough one-on-one duel, was defeated by him. She and her fellow commanders later witnessed Gaohm's fight against all three of the B-Fighters and his seeming demise, only for him to return as a massive torso floating in space and recall all three of them to the Jamahl Fortress.
After Gaohm created Black Beet to be his new warrior and counter against the B-Fighters, Jera became increasingly envious of Gaohm's increasing favoritism towards him.
Jera later learned that Gaohm had killed Gigaro, causing her to turn against Gaohm. When Schwartz became insane after losing his body, he tried to kill Jera, but she was saved by Black Beet.
After seeing Gaohm blow up Hidra in an attempt to kill the B-Fighters, Jera decided to act against her leader. She soon discovered Gaohm's true form, but was mortally wounded and cast down to earth soon after. She was found by the B-Fighters, and her mask disappeared to reveal her as a blonde, caucasian woman. She then told the B-Fighters how they could infiltrate Gaohm's ship before dying.