The build looks quite good, I used to build him a bit similarly a long time ago, just with Madred's Bloodrazor (when it was still available) for some extra AS and percentage shred. I also had many different builds, e.g. on-hit bot lane, AD/crit, tanky BotRK/Runaan, full onhit, etc.

As for the example build, I really miss Nashor's and Rabadon's in it. He needs huge AP to burst the squishies in just one combo, as his cooldowns are pretty big (other than his ult). If the enemy is not squishy, he needs more attack speed to apply his W more times (and the extra AP ratio is also nice). I'd remove Seraphs and either RoA, but you'll become a lot squishier without the health and shield those items offer you.

I am not gonna try your build, I think it's not bad, but I'm too comfortable with Kog in jungle to actually try him on mid where it's quite a hell for poor Koggy. In case you were interested, I made a guide about this, it packs some huge magical damage on his autoattacks while giving him huge sustain from Feral flare multiplied three times by Runaan's.

true, but if u look above ur comment, Ive already got some feedback, which is what im looking for, Im also in league Skype group, So it allows them to see it as well ! But, so far I am fairly happy with the guide

If the guide is a "Work in Progress" then don't post it yet (If you really aren't done). You should always wait until you are 110% positive that your guide is complete and then post it.

I liked where the guide was going, until after the cheat sheet. Nobody wants to read a guide that lacks a fair amount BBcode and has walls of text.

Now for your cheat sheet:

• Instead of Expose Weakness , take Double-Edged Sword .
• Greater Mark of Magic Penetration is good, but how about trying Greater Mark of Hybrid Penetration? You rely on your basic attacks on poke heavily, especially early game.
• I recommend running 21/0/9 for:
  1. Fleet of Foot - To help your weak mobility
  2. Meditation - To help with your mana problems
  3. Runic Affinity - The longer your buff lasts, the better. Especially when you rely on it heavily
• You spelled necessary wrong.
• CORE ITEMS should be renamed EXAMPLE BUILD.

That's all for me, I hope I have helped. And good luck!

Nice guide!