Sekkai

Sekkai is a major antagonist in the CHAPTER AU. She is an OC played by Cor.

Information
Sekkai is introduced as Eren's partner, both working for Overhaul. However, it is later revealed that she did a lot of things both Eren and Overhaul were unaware of, as she knew Eren was going to betray the Strikers.

Her Quirk is similar to Kurogiri's in that it involves teleportation. However, she can only teleport people if they are wearing a special red ring. Because of the nature of her quirk, she is rarely in the front lines fighting. She is used as an escape for the Strikers when things get too rough. When a Striker says "I request a retreat", she knows to pull them. People disappearing by her quirk are described as "dissolving", and people appearing "fizzle in".

Sekkai is related to Aria and Iva. According to Aria, Sekkai went missing a few years prior. She is Aria's older sister and Iva's firstborn child. Prior to this reveal, the only clue Cor gave was the color of the family's hair. Aria mentions a missing sister almost immediately after her rescue, but the reveal does not come until later.

Backstory
Sekkai's backstory is currently unknown to the story. Cor has not revealed it yet.