Above are cardboard cutouts that Toei seems to make all time, these started around Goseiger or Shinkenger.
Following info and pics from http://henshinjustice.com/2012/01/28/more-gobuster-info/:
Hiromu Sakurada the 20 year old, who transforms into Red Buster, has an older sister by the name of Rika Sakurada. Rika seems to be aware of Hiromu’s identity as Red Buster, and she’s against him fighting against the Vagras.
By inserting a program into their bodies, Hiromu and friends gained superhuman powers. But in exchange for these powers, they were given a secret weak point in return. When Hiromu sees a chicken, he’ll panic and his body will automatically freeze.
The Gobuster’s also have a support team, consisting of the operator Tooru Morishita, the commander Takeshi Kuroki and the newly recruited operator Miho Nakamura. Tooru works as the informant, keeping the Gobuster team updated on the Vagras.
13 years ago, a virus managed to penetrate through the system at a research lab. The virus infected a certain program, causing Messiah to be created. The scientist, Sakurada, sent to whole building together with Messiah to a subspace, thus saving the world. That scientist was Hiromu’s father, Yousuke Sakurada. The virus program, Messiah, eventually became the leader of the Vagras. The Vagras army is now working on bringing back Messiah to earth.
A Megazord is created at the same time as when a Metaroid is created. The Megazord stays in a different subspace as it’s powering up. It’s completed when the Megazord takes in the Metaroid’s powers.
Enter is played by the actor, Shou Jinnai. Enter works as a spy for the Vagras on earth.