Intro:

I am M7 Poppy Jungle Main. I've been fond of this champion for a long time experimenting builds on her. I used to focus on damage builds for fun in the past, but now shifting towards tank. I can still do good damage, but rather be durable than vulnerable.

Update:

I have changed my runes to focus on three builds. I don't do too much experimenting because I have gotten the results for every one of them. I'm going to stick with Damage builds fused with tank items.

Dark Harvest has now become my primary rune set to go using the Sunfire Aegis Build. because you can tank and still have do damage at the same time along you stack your harvest count.

Use the Divine Sunderer Build when facing against tanks, but sometimes it's best using Sunfire Aegis for your team.

Duskblade of Draktharr is good when they have no tanks on the team, but the difference is your build tank items on top of Duskblade.

I swapped Sudden Impact to Cheap Shot because you'll always face against enemies weak against true damage plus cheap shot applies to all Poppy's damage dealing moves. I also changed my offense rune to attack speed because you can clear faster early game and also delete an enemy you gank early.
It's working out for me very well.

Your Path:

Your path is to dominate the match best as possible, but also observe your enemies and teammates play style. That way you can predict how the match will go regardless of your performance. Strike fear into the enemies best as possible by playing flawlessly and I guarantee they will break fast blaming each other. If your team is bad then take the L like a champ and get ready to win the next one. Overall keep your will steel like a warrior.

The Rune Sets:

Each of my builds are effective with the item sets I have displayed for, but if you want to alter them to your favor you can. That's the beauty of finding your own style that works.

Dark Harvest Set:

This rune set while it can be amazing early, but if you're not getting any stacks it will suck late game and hinder your performance. I recommend this build if you're going to play aggressive, but you have to gank a lot to make it effective late game. This also boost your teammates morale when performing well.

Hail of Blades Set:

This rune is effective early game, but falls off late game. However due to having nothing. but damage builds the damage hardly falls off making this rune set very delectable to play often than other rune sets.

Grasp of the Undying:

This rune set is primarily for Bruiser or Tank builds to stay in extended fights. Very durable and hard to kill due to your second wind hp regeneration and revitalize shield bonuses. Every for seconds your gain and significance of self heal while doing damage.

Conclusion:

My builds might not be everyone play style, but have fun with it if you're interested in Jungle Poppy. When you dominate your enemies executing them. There's a possible chance even in rank matches they will rage quit or call you out in /all chat. If that happens expect an easy win because now your enemy team is not only tilted, but losing to a Jungle Poppy messes with their minds leaving scar of fear.

Good Luck and Have fun!

Feast well Poppy lovers.