Suggested Katarina Changes...
Ideas: Change all her abilities like so.
Passive: Voracity Instantly resets W and E, and removes 15 seconds off of R on kill. Half cooldown on assist instead. If Katarina's Bonus AD (not from base level scaling) is greater than her Total AP, all of her abilities will do Physical Damage. The inverse is also true; if her Bonus AD is greater than her Total AP, then all her abilities will do Magic Damage. If Katarina has more than 0 AP, and has bonus AD from items, or if both are equal, then Bouncing Blade's Mark, and Sinister Steel will do physical damage.
English: If she builds ad, she does physical damage, if she builds ap she gets magic damage. If she builds Hybrid, she gets a little of both.
Bouncing Blades: Cooldown is now 20/18/16/14/12 Damage is now 80/110/135/170/200 +60% of AP. +40% of TOTAL AD. Mark Damage is now 35/50/65/85/100 +20% of AP. +15% of TOTAL AD. Passive: When Q's mark is proc'd on an enemy CHAMPION, Q's cooldown is reduced by 1/2 of the maximum cooldown (10/9/8/7/6). This doesn't make it reset if more than 2 champions are proc'd. This procs on hit effects. Each bounce does 20% less damage. This is 10% when it bounces from a minion.
Sinister Steel: Cooldown is now 5 seconds. Damage is now 60/90/120/150/180 +35% of AP and +50% of TOTAL AD. Movement Speed is now 35% at all ranks.
**Shunpo: ** Cooldown is now 10 seconds at all ranks. Damage is now 75/100/135/150/175 +50% of AP. Damage reduction is now 2 seconds long. Shunpo has a .5 second windup when targeting a non-enemy target. Shunpo has a .375 second windup when targeting an enemy. (She will still get there, it just takes some time) Katarina will attempt to AA the target when shunpoing to them; there's no AD scaling here for that reason. It resets the AA.
*Death Lotus: ** Cooldown is now 60/45/30 Damage is now 150/275/400 +175% AP and 200% Bonus AD. Channel Time is reduced to 2 seconds. Damage is now done every 1/5 (Was 1/10 of a second, but that didn't distribute the damage evenly enough :/) of a second.
Reasons: I shifted the damage from Death Lotus to her other abilities so she wouldn't be too ult reliant. Shunpo is no longer a blink really, so it takes her longer to face roll. It also gives more leeway for her enemies. I also wanted her to feel like a Hybrid like caster, or if whoever was playing her wanted to be AD or AP. Bouncing Blades has a higher cooldown to prevent her from "joke poking", and making her qwe combo more reliant for poking.