Blue and Red

Blue
Blue (Aka: Arnold) is a soul with blue eyes, it loves Red, it is visible to humans even tho it is a soul

Red
Red (Aka: Alan) is a soul with red eyes, it loves Blue, it is visible to humans even tho it is a soul

Method
Blue will distract the victim while Red will sneakily kill it

Containment Procedures
Simple cell, they are to be given a human to kill every month, Sara and/or Lance are not allowed to give other Specimens or special staff to Blue and Red to kill, "You make me clean the mess every month" is not an excuse, you are not allowed to give any Specimen a Specimen or special staff to kill so why would Blue and Red be the only ones that you can give special staff and Specimens for them to kill? Seriously you killed 2 Specimens before Peter demoted you and removed all of your permissions to Blue and Red

Trivia
Blue and Red are one of the only creations that don't have any inspiration

Blue and Red are best friends (obviously)