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rokegle135
Zero and the elf was introduced in the last one or two chapters.
The elf is a random girl they found behind an illusion barrier that they saved.
Problem is elves are pretty much always slaves because of racial conflict.
IIRC the MC is currently looking for other elves who escaped slavery to take care of her.
Zero, on the other hand, is the leader of the "holy knights"
They seem to be invading nearby villages because of a religious conflict.
So far we only really know that she is super OP and is a very crass and crude person and nothing else.
She might have some kind ability to delay / slow / stop time considering what happened to the oni and how she defeated the hero... but its just my speculations.