Lulu top is not viable as a main pick. She can counterpick some tops spectacularly and gets counterpicked to hell by others. She dies incredibly fast against a bruiser with a gap closer, such as (especially) Xin Zhao.

My friend used to main Lulu top with over a 70% win rate. His build could be incorporated into this build.

Core: Mallet, Bloodthirster/BotRK, Runaan's
Early vs. AP: Wit's End
Mid-late: Guardian Angel
???: Zeke's Herald

I understand this, that's why you get a +0 instead of my customary (and nefarious) -1. However you don't seem to understand the problem with Nashor's Tooth. Nashor's Tooth is only built on champions with AP scaling on their autoattacks (ie Teemo and Kayle). Lulu does not have it.

To be fair, Lulu is one of the most difficult champions to itemize for because she has extremely ****py scalings. She scales well with mpen and cdr, and scales very badly with AP. Aegis of the Legion btw is core on her, because not only does it give her the durability needed to run into the fight and do things, it also increases the effective health of her shields and ultimate for her teammates.

I think people shouldn't vote at all if a guide is unfinished...

But you should really include warding, match ups, situational items, etc.
I can tell your guide is definitely not finished, so I'll hold off on my comments and vote till then ^_^

I agree, pure support Lulu is undoubtedly the best option in most circumstances, especially at higher elo play. Splash AP I don't have much experience with, although when I've played it I've found it underwhelming, as have most people I've talked to about it. Hybrid Lulu is still a viable build though and does excel in certain situations. My build isn't the best, but I hope to continue improving it. It's just that with the s3 changes she, like most supports, isn't forced to go pure support anymore, so there is a lot more scope for alternative builds.

Hybrid lulu is more something pricks like Berzerk do at top lane. huehuehue.

I think the most significant point is

Is hybrid lulu better than splash ap lulu?
Is hybrid lulu better than pure support lulu?

I personally think he answer is no. I think hybrid ap and support is the best.

First of all I'd like to say thank you everyone for the responses so far, positive or negative. I'm more than happy to take constructive criticism on board, as I know I'm not the best player in the world and I'm learning all the time. I'd like to take the time to address some key points.

Guide length:

I was trying to keep everything short and sweet, but there seems to be a unanimous opinion that it should be longer. I will endeavour to elaborate on my choices in my next update and flesh out the content some more.

Quintessences:

Since the increase in global gold, I haven't been running gp10 quints, as I haven't really felt the need. I don't usually struggle to pay for my build, although I will do some further testing of gp10 quints versus mpen quints.

Masteries:

Again, I didn't really see the need to go all in to the utility tree, as I never found myself needing the move speed or cdr that much. On reflection however, it is probably a sounder choice than hp regen. I will test it out and get back to you guys.

Mallet and Nashor's:

Mixed opinions here it seems, although a lot of you are saying Mallet especially is quite expensive. I do of course agree. Phage is the essential item and Mallet is the worthwhile upgrade if/when you get the gold. Perhaps I should've noted that in the guide.

Nashor's on the other hand...well, I found it does everything it says on the tin. It gives a hefty chunk of CDR, meaning you don't have to go along the Kindlegem route, freeing up your gold for other things. The AP and mana regen (from Fiendish Codex) is a massive boon to your laning phase, primarily for damage on your Q and E, as I noted in the guide. Mid/late game, these two stats fall off of course, but the attack speed contributes towards phage/mallet procs. This is what the build is centred around: phage + attack speed. I just thought Nashor's was simply the best item to provide attack speed in Lulu's case.

Liandry's:

This has popped up in a lot of comments. I know Lulu does benefit from it a lot, but I struggled to work it into a hybrid build when testing. This is mainly because it focuses on rushing ap/mpen early game then moving to ad/as mid/late game. Guise into Liandry's just delayed that move too long, whereas Nashor's bridged the gap nicely, allowing for a faster Phage. I see the potential of it as a late game item and it would admittedly provide some good damage. I might test some more (with gp10 quints as well) and revise my section on Guise in a further update. Likewise, to this end, I will also test Malady to see if I can work it into the build with the extra gold.

I think those were most of the recurring points. Thank you all once again for the comments, I'll endeavour to test and update soon!

The reason why liandrys is so great on supports like lulu and zyra and sons is because unlike Lichbane, the individual components are cheap and really good, and she has spam able movement inhibitors to capitalize fully. Aegis is really good, but it's a situational item. They must have A. Aoe and B. mixed damage. If they have a bunch of physical single target, it's pretty useless, as is the upgraded aegis as it just bumps up MR.

Lich Bane is too expensive to be useful. I already explained why Nashor's Tooth is a ***** item. Frozen Mallet is too expensive. Liandry's Torment is not that bad, at 2900. Actually if I were to build damage, I would likely build Wit's End or Malady straight up.

The change which allows supports to be richer is basically that the amount of ambient gold was increased, at a slight decrease to gold from minions. And then of course there's the Pickpocket mastery now.

They aren't good ideas. Liandrys on lulu is a good idea, if you had a successful bot lane.

Very good idea, it works a lot !