How to counter KATARINA "The Sinister Blade" in Mid lane

Katarina is a melee, mage and assassin who excels purely dealing as much damage as possible and taking out your entire enemy teams. Katarina specializes in cleaning house in the end of the battle, as enemy champions fall?, she can casts her abilities again.

Now!, Let's talk about her abilities.

Katarina's passive ability is VEROCITY

Scoring a kill or assist will reduce the cooldown of Katarina's abilities by 15 seconds.

 Katarina's first ability is Bouncing Blades
Active: Katarina throws a dagger that bounces from enemy to enemy, dealing magic damage and marking each enemy hit for 4 seconds. Bouncing Blades hits a total of 5 unique targets (4 bounces), each striking the closest next target. Each subsequent hit deals 10% less damage.

Striking a marked target with an ability or basic attack will consume the mark on the target and deal additional magic damage.

 Katarina's second ability is Sinister Steel
Active: Katarina whirls her daggers, instantly dealing magic damage to all nearby enemies. If she damages an enemy champion, she gains movement speed for 1 second.

 Katarina's third ability is Shunpo
Active: Katarina teleports to target unit and gains 15% damage reduction for 1.5 seconds. If the target is an enemy, the target takes magic damage.


Katarina's ultimate(ult) ability is Death Lotus
Active: Katarina rapidly spins in place and channels for 2.5 seconds, throwing a barrage of up to 30 daggers at the closest 3 enemy champions within range. Each dagger deals magic damage and applies Griveous Wounds for 3 seconds, reducing regeneration and incoming healing by 50%.

Death Lotus can hit a single enemy champion no more than 10 times.

http://leagueoflegends.wikia.com/wiki/Katarina

--------------------------------------------------------------------------------------------- 

Question is, how will you counter Katarina? how will you stop katarina by killing you and your team so fast like a in a blink of an eye?.

Think about her Ult, Her ult is so strong specially when you got combo with her other skill (that's purely damage she can exert). The Logic is? you need to stop katarina by channeling her ult, in short IMMOBILIZED her.

Immobilize: to keep (something or someone) from moving or working : to make (something or someone) immobile such as STUN, SNARE, KNOCKED AIRBORNE, KNOCKED BACK, FEAR and SILENCE. 

So you need to pick some champions that have this ablities.

here are my top 3 champions I think it's effective to counter Katarina and defeat her in mid lane (because katarina is usually laning at mid lane).

1st is FIDDLE STICKS "The harbinger of doom"

 

By using his TERRIFY (His first ability) Katarina will not able to take some actions, instead she's feared. So when katarina use her ult to you? terrify her immediately. When she is on fear, that's the time you can use your other skill and kill her.

2nd is Syndra "The dark sovereign"

By using her Skater the weak (her third ability)  you will be able to knock her away (knockback). So when katarina use her ult? knock her away, so her ult is useless and have an advantage on long distance chasing (Syndra is long range MAGE).

3rd is Diana "The Scorn of the moon"

By using diana's third ability (moonfall) you will be able to draw katarina at your side. So when katarina use her ult? use moonfall to stop her ult, at the same time you have the advantage to kill her immediately because that's the specialty of diana (close range fights).



Note: This is only TIPS (suggestions) of me, you can use any champion to defeat katarina. Because in the end of the day, it depends on how will you use that champion to defeat katarina.

Next champion to counter: Darius "The Hand of Noxus"