Hi, im Katarina2073, Polish Katarina otp. Sorry for my bad english, dont really know it. I've been playing LoL since season 6 and so i was maining Katarina from then. The rework opened me some new paths and i completely loved so i continued the otp. Now i have something around 700k points on her and im in gold. I record some videos on youtube so you can check it out and leave your opinion!
Play Video

PROS + Very mobile + Good roams early on + Shreds squishies with op burst dmg + Easy early kills especially when you hit 3lv + Mid-Game is just beautiful + AoE dmg on almost all skills Katarina is mid-game monster! If you are not playing versus a champion with cc ( Malzahar Brand Ahri) or strong early ( Yasuo Ezreal) you can easily get your kill at lvl 3 if everything goes good. Roams on bot should be your routine every game, ESPECIALLY after getting gunblade cause that's kata powerspike where she can practically oneshot every squishy in the game. AoE dmg helps in teamfight, and the mobility is good versus champions with skillshots like Elise or Karthus.

CONS - Any CC and you are pretty much dead - If enemies build only MR early on its hard to do something - Much counterpicks on mid - Easy to play hard to master - Pretty squishy and must depend on team early If i would say what's the biggest Katarina fear i would say CC definetly, especially silence and slow. Counterpick pool is really big so you need to be careful when picking kat to not get your *** kicked and feed. Early if u play against some assasin like Talon or burst like LeBlanc you will be having a bad time. Also, if enemy build hard MRs early on you won't be able to do much, that's when roaming bot and hunting squishies kicks in, mid game should be really good with mpen!

Let me know if you would like me to make detailed guide cause now i got now interest in that, will just update build for now!