Foo Fighters

Name: Foo Fighters or F.F.

Appearance: F.F. can change their appearance at any time. However, their habitual appearance is that of the deceased prisoner Atroe, a young woman of average height and slim build with a cap/hairstyles with serrated edges at the ends of their head. In the anime, the spikes on the ends of F.F.'s cap/hair jut out more compared to Atroe's, which are kept closer to their neck.

Composed of plankton, F.F. can contort their body into normally impossible curves and even slip through barred fences unharmed.[4] F.F. can divide themself into multiple sub-bodies, which take form when initially fighting against Jolyne and Ermes. F.F.'s main body can take form outside bodies of water when they collects enough plankton.

F.F. is commonly shown carrying a 32 oz. cup on themself when they are not near a water source.

In the Stand form, F.F. takes two main appearances. Naked, a tall, dark, robotic humanoid of masculine proportions, and an alien visage. As F.F.'s identity develops due to them experiences with Jolyne, the true form of them Stand takes on a more human appearance starting to resemble the body they took over while still retaining some of the features of them

Personality:F.F.'s personality hinges on the fact that they possess "intellect" but little life experience. During their introductory arc, their only goal was to obey Whitesnake's instructions to guard the discs. As their guardian, F.F. ruthlessly attacks and kills anyone who approaches the disc's hiding place, regardless of their threat level. Being an intellectual being, F.F. places great importance in themself and implores them enemies to recognize them as sentient by calling them by their names. They also quote the astronomer Fred Hoyle to claim an "intellect" is guiding the universe, even predating it, all to say that even insignificant beings like plankton are capable of possessing intelligence.

When Jolyne shows mercy toward them and saves them from dehydration, F.F. discovers a new outlook on life and grows interested in them, pledging to protect Jolyne and accompany them from now on disguised as the prisoner Atroe.

F.F. was shown not to have much of an eye for detail prior to meeting Jolyne Cujoh and Ermes Costello and laments their existence upon expecting death after being defeated by the two. When Jolyne saves them, however, F.F. immediately begins to notice more details around themself and comes to perceive the world around them as being more colorful. As a result of experiencing this whole new environment, they become extremely curious about everything around them, constantly asking questions to people and experimenting with the world, for instance, trying to do the contrary of what Atroe would have done. While they get along with others, F.F. has the strongest affinity for Jolyne for giving them freedom and "intellect", of which losing is their greatest fear.

F.F. can't live without drinking constantly Because of their great dependency on water, F.F. is obsessed with it and goes to great lengths to constantly hydrate themself. F.F. carries a cup of water and will fight anyone over it, as well as drink any liquid as long as it contains water, be it blood or spit. Being a mass of plankton with no experience of society, they aren't disturbed by any of this.