Hey, Dumby here,
I know some of you, (Read: Most of if not all of you) are confused about Jenny.
Well, the idea I had in mind for jenny's character, was that she was someone Selena pulled from a Bad End timeline. While yes, the Ruin was slain, so was she.
And Nameless MC's Wish was to 'become her' so to speak. Selena basically copied the MC's thought process and applied it to Jenny, but because MC was the weaker ego, Jenny absorbed it, so she gained most of his snarkiness and all of his knowledge of media and other popular artistic outlets.
It's like reading a book or watching a movie. You know things happened, but they didn't happen to 𝘺𝘰𝘶, so they held no emotional value to your brain in the grand scheme of things.
Some characters were changed, like Darkness's and Megumin's sexuality, but think of it as cosmic coincidence fuckery at play. Because without 𝘴𝘰𝘮𝘦 kind of indecency, It wouldn't be webnovel.
That and Kazuma's snark and attitude fit my brother to a T, so while it isn't that hard to write him, he'll inevitably be slightly different.
See ya,
Dumby, Out.
That's the gist.