Maybe I'm grasping at straws here, but I'll try to take my theory further. (I'm probably not the first one to point this out, though).
I do think there's going to be something shady with Arieth going on. She does have a name that's often mispelled with another character. They are in fact anagrams: Aerith/Arieth. They are even somewhat similar characters. (Check their eye colour too).
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And you know how Aerith ended up. Arieth is a funny and jovial character, used for comic relief most of the time. That would make it more impactful, because you don't see it comming. I hope I'm wrong.