I've always been a strong advocate of the on-hit/AP Kog build since it boosts all his abilities. It's only weak point being that it leaves Kog really slow. So I tried out an AD build of IE + 2xPD and wow it is just devastating. LA doesn't scale quite as well but it still does good damage. But you've basically got a 750 range auto-attack that's critting 3/4 attacks for nearly 600 with an additional 6% of HP magic damage on top. I was melting down their tank from full HP in 3 seconds.
And between having movespeed near 470 and your slime trail, you should be able to dissuade most heroes from getting close to you.
Yeah he's pretty badass either way but IIRC a forum post correctly CandyPanda actually builds Kog as a straight AD carry more often than the hybrid build.
