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Evangelion Unit-00 Type F (エヴァンゲリオン零号機F型) is an Evangelion Unit that appears in the novel Neon Genesis Evangelion: ANIMA. It was intended to be piloted by Rei Trois, but it was later refitted to be piloted by Rei Six.
Evangelion Unit-00 Type F is a Stage 2 Evangelion Unit, being the same one as Evangelion Unit-00' that fought against Armisael, the core was salvaged and used spare parts of the Evangelion Unit-00 and the F Type equipment to produce this Evangelion. It only possess one operational leg, the right leg was substituted by a skid-shaped prosthesis that allows the Unit to take a more stable shooting posture.
The reason the limbs were removed were that to generate the needed A.T. Field to use the Angel's Backbone and the Type F can't be removed. Because it is the last line of defense of NERV Japan, it does not possess a S² Engine, with the energy being supplied by cables via an umbilical cable. It is theoretical possible to replicate the results of Operation Yashima. 
The only difference in the Evangelion fitted for Rei Six was the different entry plug, where Rei Six could operate the Unit-00 Type F. This change was due to her size in comparison with Rei Trois.
It was later upgraded once again to use the Allegorica Equipment, being turned into the Evangelion Unit-00 Type F Allegorica.
The right arm was also removed and in the position it was installed the Angel's Backbone. The Angel's Backbone is one of the strongest A.T. Field weapons that uses the accelerated heavy particles to corrode A.T. Field and accelerates the particles even more as it uses its own A.T. Field.
It first appears defending NERV Japan against the attacks inside a facility located in Mount Komagatake, part of Mount Hakone. It was in a fixed armored facility that was connected via an underground transport and an elevator. It used the Angel's Backbone to target the missiles launched by planes, since the planes themselves were too far away to snipe it.
Notes and references
- Evangelion ANIMA - Visual Book p.10