An idea for a Katarina mini rework (be open-minded)
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Katarina faces a key problem during the early game and that is a miserable laning phase when it comes to farming against most opponents with a lower cd ranged projectile. Additionally I can't help but think about how Katarina is mostly using short blades rather than daggers and thought "the daggers in the cinematics that she throws at people makes much more sense. My idea is improve her laning phase by making her Q throw out 3 daggers in rapid successing similar to a xayah Q but with slight movement after the cast similar to a taliayh q (just much faster). The function of this new dagger throw however is a skillshot that goes through minions for waveclear improvement. This also acts as a placement type of aiming system (think Olaf axes) so that you can place the dagger where you please, within the confines of the abilities range. in doing so she gets to choose where to throw it which also provides more outplay/ mobility options while also making it more difficult for her to land it on champions (because the trailing effect from the lock on dagger will no longer be there). Thematic-wise it will also be more satisfying to see Katarina actually using daggers instead of long blades that will give her a feel or her cinematic correctness. This is a double-edged sword kind of update that will improve her laning-phase farming and mobility, while also providing more counter play and a raised skill ceiling so other champions can deal with her just a little better. Side-note this is also with the assumption that the daggers will reach the destination you choose at the same amount of time that it takes now. She would most likely get some number tweaks due to all 3 daggers doing damage in a line.
TLDR VERSION: Q is now shooting three daggers in a line dealing damage, skill placement based (like Olaf Q) daggers are the daggers from the cinematic that she throws at people to better fit her theme of daggers versus short blades.