Thanks for your work.
I think you have misunderstood something. Tsundere comes from the action onomatopoeias "tsuntsun" and "deredere", and going by the
bouba–kiki effect "tsuntsun" should be more spiky (and therefore harsh) while "deredere" should be mellower. Proof in case, originally tsuderes were girls that started all "tsuntsun" and ended all "deredere", which translated in romances where the girl was harsh with the MC, to the point of seemingly hating his guts, but by some point in the latter half of the story was a maiden in love. So you are asking the author for Narae to be even more extreme.