Lulu is a supporty Ap top laner OR she can be played as an Onhit/ Ad type of champion. The reason she is so diverse is due to her skillset. Her passive is a free bonus magic damage BASED ON HER LEVEL, this is the main reason people will build AD/AS lulu top, as you do not need AP for the passives scaling. Lulu's other skills are very nice support abilities with decent ratios (Ap top lulu) BUT with good base amounts as well (Ad/As Lulu). Lulu is a very diverse high skillcap champion who's kit can offer a lot to her team both offensively an defensively. One of the main aspects of Lulu that takes learning is when to use your abilities offensively and when to use them defensively (As most of her abilities have 2 abilities that differ when used on an ally or an enemy.) She brings a good amount of CC to the team and can help her jungler in ganks by turning the enemy into a fluffy creature and slowing them. She also has a knock up on her ultimate that turns her ally bigger.

(Passive) Pix, Faerie Companion- Pix fires a barrage of 3 bolts, dealing 5 + (3 per 2 levels) magic damage each, totaling 15 + (9 per 2 levels), at whomever Lulu attacks. These bolts are homing but can be blocked by other units.
Lulu's passive is one of the main reasons she can viably go top. A on hit damage magical damage bonus. This keeps you with a good ability to harass even if you are out of mana.
Notes: The Onhit effect CAN be blocked by the enemies (Like a Caitlyn snipe) . Something to always remember is that this skill is shot from PIX'S location not yours. Also note that when you are last hitting if you shoot at a minion in the middle of the wave YOU WILL DAMAGE MINIONS IN THE FRONT. Even if it may not seem like something that is a big deal, it is. This can result in pushing your lane and being in an unfavorable position.

Glitterlance- Lulu and Pix each fire a piercing bolt that deals 80 / 125 / 170 / 215 / 260 (+50% of ability power) magic damage, slowing enemies hit by 80% for 1 / 1.25 / 1.5 / 1.75 / 2 second(s). This slow decays over time. An enemy can only be damaged by one bolt.
Lulu's Q ability is a straight skillshot shot from BOTH her and Pix (A single enemy can only be hit by 1 of the skillshots.) It has a VERY HIGH slow as well as a really strong base damage. The slow keeps her safe from most close range champions that want to harm her and will give her time to escape champions that use their gap closers to harm her.
Note: This skill can be trick shot very easily. Shield/damage a minion and use it as a 2nd shooting angle. The enemy will be having to keep track of 2 enemies instead of just 1.

Whimsy- On ally cast: Target ally gains 35% movement speed and 20 / 30 / 40 / 50 / 60 bonus ability power for 5 seconds.On enemy cast: Polymorphs an enemy champion for 1.5 / 1.75 / 2 / 2.25 / 2.5 seconds, disabling their ability to attack or cast spells and reducing their base movement speed by 60.
This skill can be used both OFFENSIVELY AND DEFENSIVELY. If used on an enemy you turn them into a fluffy creature slowing them and rendering them unable to do anything but run around.
If this skill is used of yourself or an ally, the target gains movement speed and an Ap bonus. Now when you think of it both of these have an offensive and defensive purpose. It can be castes on an enemy offensively to prevent retaliation in a fight or trade. It can be used on an enemy defensively if they get to close for comfort and could try and CC you. It can be used on an ally AP like Veigar to set up a good fight by using the mobility to get in range for his CC and the AP to help burst. It can be used defensively on a team mate to give them a ghost effect for a short duration.
Note: This does not stop channeled abilities, the enemy will just be a fluffy creature channeling a deadly spell.

Help, Pix!- On Ally Cast: Commands Pix to jump to an ally and then follow and aid their attacks instead of Lulu's for 6 seconds. Upon arrival, Pix shields them from 60 / 105 / 150 / 195 / 240 (+60% of ability power) damage for 6 seconds. On Enemy Cast: Pix deals 80 / 130 / 180 / 230 / 280 (+60% of ability power) magic damage to target enemy unit. Pix then follows and grants vision of them for 6 seconds.
This skill is Lulu's "Choice between offense and defense" skill. You can use this on yourself or an ally to give them a shield for safety OR you can forgo safety and instead choose to use it on an enemy for more damage and sight of them if needed to chase. This skill is not as in depth in top as bot lane, as you are the only person you need to worry about. Though it should be noted that with this skill Pix will fly on your picked target (enemy or ally) so it can be used as a positioning move for your Q. Many players overlook all the strategy an move combinations Lulu brings to the table.

Wild Growth- Lulu enlarges her ally, knocking nearby enemies into the air. For 7 seconds her ally gains 300 / 450 / 600 (+50% of ability power) bonus health and slows nearby enemies by 30 / 45 / 60% for 1 second.
This is Lulu's ultimate ability, and quite frankly its pretty awesome :P The ability acts as a Nasus or Renekton ultimate as it makes the champion it is casted on bigger an have more health. However unlike their ultimates it does not have an AoE damage aura, it has an AoE slow aura. This allows your new Godzilla creature to stay on it's targets. Though me saying this is still leaving out some of the biggest parts of this skill. It also KNOCKS ENEMYS BY THE TARGET UP INTO THE AIR. The Hp amount on this skill has an AP ratio as well meaning of you decide to build AP this skill makes your target Insta-Tanky. The skill is very good for baiting ganks as well as aiding in team fights with CC.
Note: The hp gained on this skill is BONUS HP ADDED, it is not "healed" so healing reduction effects such as ignite do not effect the amount of health gained at all.

Skill Order:

This is the standard lulu skill order that allows you to make use of her high glitter lance damage and poke most enemies out of lane.

This skill order can be used if you will be jumped on a lot and want to shield a lot of the enemies harass.
Combos:

Auto-Q

General Harass

Auto-Q-W enemy-E (yourself if the enemies trying to fight, the enemy if he is trying to run.)

Nasus (Deny his farm and zone him with your early burst)
Garen (Wont ever reach you)
[Riven]] (Poke and do not let her reach you)
Jax (shield when he hops in,poke, make him fluffy and back off.)
Wukong (When he hops in shield and Q. The AoE will hit him through the stealth and you will counter trade hard)
Darius (Avoid his painfully obvious pull, If he ever does hit you just make him fluffy and back off)
Renekton (You can shield his trade and countertrade hard, prevent him from sustaining back his hp with more poke)
Volibear (Will not touch you, and you poke him to hard.)
Teemo (You out trade him).
Olaf (Doesn't trade well with you.)

Vladimir (Pokes, sustains, and scales harder than you)
Poppy (will outscale you, and you cannot pressure her enough)
Nidalee(has the same basic concepts in lane as you)
Warwick (Just sits in lane and farms all day TO TANKY!)

• Remember Lulu's abilities for the most part all have offensive and defensive uses. Try and plan ahead as to which uses of each skills you will want when you go to fight the enemy.
• Throw autos out whenever possible, the bonus damage may seem small but it adds up fast.
• You should typically factor in your AD carry when deciding how to build Lulu. If they are strong early and weak late consider AD/AS. If they have a stronger late game consider AP lulu.

• Do not dive a lulu. Polymorph and her ultimate make her way to safe.
• Get hybrid defense runes against Lulu as she deals out both physical and magical sources of damage.
• Lulu has amazing poking potential. Always watch for her Qs as they HURT and prevent you from counter trading due to the slow.

Ap Lulu

Philosopher's Stone, Heart of Gold, and kage's Lucky Pick - Lulu is pretty safe, so if you are fighting a laner you feel you can't kill and just want the lategame stack these and farm.[/color]

Rod of Ages - If you are vs a high burst lane OR a lane that is not limited by mana this item choice can help you survive and stay in lane. The item will also make you pretty tanky for the rest of the game.

Rabadon's Deathcap- This item makes your numbers on your skills SKYROCKET!

Deathfire Grasp- This will keep your burst potentially decently high as the game goes on.

Void Staff- The penetration is nice if the enemy team is stacking MR.

Abyssal Mask- This item is good if you are laning vs another AP. This is also good if your team has an AoE AP caster mid.

Will of the Ancients- Gives you sustain, only get this if your mid laner will use it.

Zhonya's Hourglass- Good for when you start to get focused and have skills on CD. The chain vest. An be build in lanes vs heavy AD damage dealers.

AD/AS Lulu

Wit's End- More magic damage on your autos and makes them go off faster.

Madred's Bloodrazor- Makes your autos chunk out a % of targets hp.

Malady- More As, gives you a sure effect, and adds more magic damage on hitting the enemy.

Bloodthirster- Gives you some sustain as well as a good amount of AD.

Frozen Mallet- The slow on this allows you to kite enemies all day long.

Phantom Dancer- As and Crit. Only build after you got some AD items.

Maw of Malmortius- Good to build in lane vs an AP. The passive ability works well with your ultimate giving you more HP.

Lulu top is decent in soloQ, though Lulu's kit generally works better in organized teams.

This is where Lulu shines. She has the ability to fill in so many different roles in comps. Such as Poke or All in. She has great synergy if your team has a strong late game carry.

Pros:

- Good poke
-Versatile
-Fun Kit
- High Skillcap
- Offensive and Defensive uses on skills.
-Underestimated

Cons:

-Mana
-Can't hard carry, needs team
-Only ultimate cancels channeled abilities.

This is my top facts Lulu. She was my birthday champion for the year xD (Champion that came out closest to March 14). She is fun to play, high skillcap, and very versatile. Currently she is on freeweek, so I recommend anyone who wants to try something new try her now. As always summoners have a good day and good luck on the fields of justice xD (I may make a preview for the new champion today when I'm on PBE. If I do I will make a new blog about it.)

SERIES UPDATE: Guide release will be Wednesday. =D