Test Subject Blue

Test Subject Blue No. 0001232423545, or Test Subject Blue, is a blue enzyme who is always seen in his prototype suit, the Rex209. He is the assistant leader of the Retro Rebels who first appeared in Nitro Mania. He is roleplayed by PeaVZ108.

History
In "Nitro Mania", Test Subject Blue is first seen raiding a science laboratory in Echo Creek with orange and green enzymes. He is later confronted by the Locked Room gang and defeated when Jaiden Animations and Rebecca Parham performed an elemental ninja combo on him. He is later seen helping Starcade a lot, and takes a lot of initiative as assistant leader to ally with the Locked Room gang when the Nitrome Boss shows up and kidnaps Starcade. In the same story, Warlock has revealed that he used to live in Nitrome until the Nitrome Boss attacked it and like the other Retro Rebels, he escaped and sought refuge in Eitbit. Since then, he has become a permanent Eitbitizen with Starcade's help.

In "Locked Room Boss Hunt: Rampage of the Retro Rebels", Test Subject Blue is the first Retro Rebel to fight against the villains. He is defeated when Electra used a magnet against him, due to his prototype suit being made out of metal.

Locked Room gang
At first, Test Subject Blue regards the gang as his enemies, due to his belief that they attacked Eitbit. However, after the Nitrome Boss shows up and kidnaps Starcade, he takes initiative and allies with the gang to rescue her.

Starcade
Test Subject Blue is one of Starcade's biggest fans as well as one of her most loyal friends. He enjoys Starcade's company and will do anything to help her at all costs.

The Retro Rebels
Test Subject Blue is generally well-liked among the Retro Rebels as their assistant leader. However, he sometimes has trouble getting along with some of them, such as Licorice when it comes to her pessimism and Hot Air when it comes to his stinginess.