Robin/Julia

Robin/Julia is the protagonist of the one shot Zone and has an appearance, personality, and Innocence that is the basis for those of Allen Walker.

Personality
Similar to that of an early-in-canon Allen, but with some large differences in her perspective due to their vastly differing backgrounds.

Appearance
Much like Allen at the start of DGM, but with longer hair that´s tied back in a ponytail. Robins body has a scar on the left check with stitches across it, and a left arm also with stitches. Robin habitually wears a broach, which has a photo inside it, and generally wears a shirt, trousers, and a long Exorcist coat. There's a round symbol (a seal) in the same place where Allen Walker has a star, which is usually covered by hair. As Robin's seal weakens the sitches streach and it is possible to see what appears to be the "skin" of a Level 0 Akuma through the gap, and as the seal weakens further a small horn grows from this Skin.

Note that Robin has no canonical hair or eye colour, since there's zero color art of Zone and we don't know if Hoshino ever even picked a color scheme.

Background
Robin/Julia is an Akuma wearing the body of a younger brother (the real Robin) who was killed by the Earl in the process of creating the Akuma (the method of creating Akuma is slightly different in Zone). The soul is that of the real Robin's older sister, Julia. 'Robin' is no longer under the Earl's control, presumably having been converted by Cross, and Julia´s memories appear to be intact. The thing preventing Robin from reverting to being a normal Akuma is a seal above Robins left eye. Robin now works as an assistant Exorcist having a version of General Cross as master, and Cross was the one who gave her the anti-akuma-weapon left arm (it had been Cross', but was transplanted to her). Robin considers it their duty to destroy all Akuma, as is committed to helping human kind.

Cross was going to take an anti-akuma weapon named 'Abaddon' to Japan to be fixed, but he left without it by accident. And so Robin set off to bring it back to him.

Abilities
Robin's anti-akuma weapon is much like Allen's, although the claw it creates is smaller and more curved, and the gloves Robin wears stretch to fit it when it activates. It can also activate without changing into a claw. In addition Robin was shown to use the legendary anti-akuma weapon Abaddon when the arm strained her body and seal to the limit. In doing so the seal was restored to full power.

Apart from abilities as an Exorcist, Robin is also capable of deliberately loosening the seal which allows Julias personality to dominate in order to access some Akuma abilities, specifically flying using the wing-like structures that Akuma in Zone are able to have burst out of their bodies, and using the left eye to lock on to targets and manage acceleration.

The stitched scar on Robins face is in fact part of the seal which is preventing them from reverting to being a normal Akuma. The weaker it is, the longer the stitches holding the sides of the face together become, and it's not a pretty sight when they get long. Activating the anti-akuma weapon is sometimes dangerous, because if overused it may sap the power of the seal, making it more likely that robin will revert to the Earl's control. When there is activity nearby from the Earl and/or Akuma, such as when a victim contracts to bring back their loved one, the scar appears to react as if in a warning, and causes some irritation.