A bit ways into writing the first draft of Resonance #3, I wrote a scene in which the main protagonist, Magnanimous, encountered a character with an extraordinary power to copy and multiply instances of a person. In this case, Magnanimous had to face off against multiple versions of himself.
I juggled around multiple names and made a post on the current work in progress:
Gilbert Beck, The Collector, whose resonance was tied to data.
However, I noticed that the third book was lacking a strong female lead, so after reviewing the possible characters, I decided to make Gilbert a female.
Powers wise, they stayed the same, except that Glenda had a resonance tied to mathematical operations, specifically multiplication and division. Given enough data, she could produce a puppet copy of an individual or fifteen if the situation called for it, though some abilities divided as the instances multiplied, which she found out the hard way.