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Rei Q in FINAL comes out woefully short.
Even though many would say that Rei Q is one of the few characters with development, I don't find it matters at all because of how bad and contrived it is. At the end of the day, it's just moe.
In science fiction, when you want to make a point about identity, it's not uncommon to introduce the concept of either lost memories, false memories to make a character question themselves.
Cloning is also an often used concept to further establish the need to find an individuality.
....but then there's Rei Q.
So Rei Q has no lost memories. She has no false memories either.
She is a clone, but she's left in a position where she's got no reason to believe she'd be anyone else than she is to begin with.
Incompetent writers often rely entirely on the idea of someone as a clone, to somehow imply they're not their own person - something which never works because a clone is by definition a new person itself.
No one questions if nature's own clones, genetically identical twins, are the same person. Nor do twins think they're the other person.
As a science fiction concept, or vehicle for self discovery, it's extremely easy to abuse in other words, and the writers incompetence and understanding of what self and identity really is, is exposed.
Going back to Rei Q, there is also a complete lack of dilemmas or reasons that hold Rei Q back to just do whatever she wants.
If we set aside the question of identity, and just focus on growth, then there was nothing holding Rei Q back either.
Rei Q's development was always a given, and provides no value in itself at all.
Just like a small child learns by seeing and doing, so would Rei Q.
The quest for Rei Q to become her "own person" was always moot, since she was her own person from the start with absolutely nothing preventing her, or otherwise convincing her that she wasn't.
In conclusion, the only role Rei Q serves whatsoever in FINAL, is shock value when she explodes for a random reason.