So far from what I've experienced Zed is a very mobile late game AD champion with ridiculous scaling passive W that gets 600+ AD and kills the hell out of everything in 1 hit.
He is not invincible but he has a lot of breathing room in terms of everything, but at the same time knowing when to go in is very important due to the lack of damage early/mid game.
I suggest Zed for mid/jungle/top but this guide is mainly from my point of view for top, enjoy!
THIS GUIDE IS THE RESULT OF 10-20 ZED GAMES IN 2200+ ELO IT IS NOT AS DETAILED AS THE USUAL (for example) ZAKKERS RUMBLE GUIDE OR INVERTEDCOMPOSERS SINGED. THIS IS ONLY TO BE USED AS A BENCHMARK GUIDE FOR PLAYERS WHO HAVE NO CLUE HOW TO PLAY ZED, FEEDBACK IS MUCH APPRECIATED BUT I WILL NOT SPEND 20 MINUTES EXPLAINING TO YOU WHY I ADDED WHATEVER DETAIL IN MY GUIDE. HERE IS MY CURRENT PROOF OF WHY I AM QUALIFIED TO MAKE A GUIDE FOR THIS HERO
DON'T QUESTION MY ABILITY TO PLAY ZED IT IS DEEMED AS "FCKING GOOD ENOUGH" ALSO I STARTED THE MARATHON WHEN IT WAS 0-2 SO WHEN THE MARATHON STARTED AND I STARTED TO PLAY HIM SERIOUSLY I HAVE WENT 13-3 instead of 13-5
anyways that's all I wanted to say for that, thanks for reading ^__^