If I'm missing a champion you happen to be going top against, I apologize. If you consider them to be a common top, send me a PM and I'll add them to the list.
Until then, use your Lulu knowledge to the best of your ability, and play passively until you're sure the fights will go as you suspect.
These Descriptions of matchups assume you know what these champions can do. If you don't know this, check out one of their guides here at Solomid for a better understanding of the champion
Ridiculous amounts of sustain make him extremely hard to bully out of lane by yourself early in the game. Lucky for you, his ranged harass is usually not maxed, and is also easy to predict and dodge. If he jumps on you, peel him off with your slow and kite like any other melee bruiser once that jump is down. Don't forget that he gains range with his ult - much harder to kite, and in general will be easier to simply avoid him until the ult range goes away. If you die early to a jungle gank he will start snowballing, so play a lot more passive at that point. Until you get Wit's End, it's generally better not to waste too much mana harassing him with spells unless a jungle gank is coming. Also, do NOT tower dive this guy alone... +200% sustain from his lifesteal is just too much to safely handle with a tower on you.
Some sustain, but no CC or tankiness. Doesn't get gap closer till 6. Her invisibility is rendered totally useless if you Help, Pix! her first. Constantly poke her, and don't let her do assassin-y things at 6. Note that her burst damage can be quite high, so don't try to go in for the kill if she has more health than you. Instead, make sure to poke her with Glitterlance and autoattacks whenever she tries to harass you, and then you can easily go for the kill if she gets too low or she jumps on you - ult yourself and burst her down.
Good sustain if you let him CS, and he is beefier than the average champ. His only real tool he can use to harass you is his Scream though, so you don't have to worry about taking damage too much. Dodge his Q's (easy with Whimsy!), watch for his flash->Feast and you're golden. You probably won't be able to kill him pre-Wit's End without a jungle gank, so don't feel too bad if you end early game with no kills.
No sustain, no tankiness. Constantly poke him and stay out of Spin range. He becomes harder if you can't dodge his pull and get combo'd too much. If you get pulled, Whimsy and Glitterlance him and get out of his Spin range immediately. Save Wild Growth till he's about to ult so you can destroy his cooldown. You can win this lane if you don't try to all-in him at equal health; harass him way down before going all-in.
Mediocre sustain, not really tanky. Has some CC and a reliable gap closer though, so if she's got an HP advantage don't be playing too aggressively. Her early damage (levels 1-4) are pretty pathetic, but it starts to skyrocket once she gets more ranks of her %-damage skills. If you can't shut her down early, don't expect to win straight 1v1's with similar HP. The fact that she is range makes her inherently harder to harass, but make sure you don't take too much counter-harass in return!
Decent sustain, has good gap closers, and can keep up somewhat with your kiting. Also blocks an autoattack. Play this lane somewhat carefully, and harass with Glitterlance more than your Autos to prevent Riposte damage. Save Whimsy for when she dashes on you so you have time to slow her and back off. If you can, save Wild Growth for when she isn't ulting, so you don't waste the knockup portion of it.
Note: Even if she Riposte's your Autoattack, Pix's bolts can still hurt her.
Has sustain, has a gun. Any time he pokes you with it, Glitterlance and auto him back for 2-3x the damage he dealt to you. Don't let him get in range to auto you; you have a ton of slow and mobility. With his lack of gap closer, you should never let him land a melee attack on you.
Poor Garen, he has absolutely nothing he can do against you. Zone him out, and just kite all day. Don't let him get in range to spin, and you'll be fine. If likes standing in bushes too much, ward it and he's back to being able to do nothing. If he's aggressive with his speed-up, save your Glitterlance harass until after he uses it to totally nullify it (If you use it beforehand, his Q will remove the slow)
Decent sustain, good gap closer, CC, tanky. If she gets even a little bit ahead of you, you have no real chance of coming back. If she dashes you, Whimsy and Glitterlance her, and try your best to hit her every time she goes to CS. Do NOT let her hit you multiple times with her true damage; you're just asking to lose. Ask your jungler to gank, and otherwise just stay alive.
F*** Jarvan. He isn't too bad before 6, but still can cause some trouble with his lance of doom. He's also one of the only top champs that has a stun directly attached to his gap-closer. The major problems arise once he gets his ult; he can 100% stop your ability to kite with it. Your absolute only chance at this lane is to somehow get 2-3 kills before level 6 (get that jungler over here!), and even then you'll be having problems. If you plan on picking Lulu, BAN JARVAN
He can deal a ton of harass with his Empower+Leap combo, and can commit to a longer fight if he decides to throw a stun in as well. Very hard to harass safely, and his low mana costs means that he'll be able to spam spells just as often as you can. Get a jungle gank early to help put you ahead if able. If he starts charging up his stun, back up and try to get out of range. If you can't, Polymorph him instead.
If you can't get a gank, avoid confrontation until 6 - focus your mana more on shielding off his harass. With your ult, you can more easily survive his all in, but you'll still be losing trades until you get Wit's End. Once you get it, you'll be able to win an all-out fight (unless he got a decent advantage in lane).
Hard to harass with autos, but if you can land your Glitterlances you're golden. Practice dodging his empowered skillshot and he has no answer to your harass. If he jumps on you, Whimsy him and barrage him with Glitterlance and autos.
Decent sustain, tons of damage. Her mana costs are as low as yours, and can poke you back as hard as you poke her. Her autos will deal similar damage, and she has similar range. She has a heal and you don't (pre-6). You have no real advantage in this lane, unless she can't dodge max-range Glitterlances. Call for jungle ganks; the only sure way you'll win trades is if you're ahead or have your Wit's End.
Battle of the skillshots. Your Glitterlance vs his shuriken. His will hurt you more (He can surge you if shuriken lands), but you have autos and Help, Pix! to put you ahead. Stay behind creeps when you harass as best as you can, and you're on your way to an easy lane.
Pre-6, this guy is laughable. If he leaps on you, he's wasted his only way to escape. If he doesn't he'll never get in range to land a Slash. His skillshot is his only safe means of harass, and it can be blocked by creeps. Beat him in the harass war by staying behind creeps and Glitterlancing / Autoattacking him every time he goes to last-hit. Smash him early, but always be near creeps in case he gets bold and tries to leap + Slash you for a good chunk of damage.
Once he gets 6 and upgrades his skillshot, the lane becomes a little more difficult. Return him poke for poke, and keep chunking him down to deter him from ever wanting to all-in you. He can do a surprising amount of damage in his combo if you're alone, so make sure he's low enough before you all-in him for the kill.
Can be a very hard lane to beat. A good Lee can shrug off a lot of harass with his shield + sustain, and his combo puts out a lot of damage early. Harass as best you can and call for a gank - If he gets even a kill ahead, he can snowball the lane out of your control easily.
Pre-6, he'll never get close to you. His Q harass can be annoying, but you can match his harass easily.
Once he hits 6, he has respectable burst. Don't do any stupid tower-dives, and don't delay activating your Wild Growth if you feel an engage coming on; he can potentially kill you mid-knockup
His wither is annoying, but he'll never touch you. Don't let him safely farm and you're looking at one of your easiest lanes. Get a Mercurial Scimitar to deal with Wither during teamfights later.
3 - 7/10
If you she can land spears, you can't do squat. Her heals make your harass almost pointless, so just farm as best as you can and wait for jungle ganks. Don't give her an excuse to Cougar + Pounce on you, she'll deal a ton of damage.
Take everything dangerous about AP Nidalee... and get rid of it. Now you're dealing with a pathetic AD champ with no good harass and mediocre sustain. You'll still want to avoid getting Cougar combo'd on, but AD Nidalee is a lot safer to poke down to a killable point.
Ughh, Nunu. His sustain is massive, and his poke hurts. It's very very hard to outdamage his sustain; you'll go oom before he does. Ask for ganks, because they're the only way you're going to make a dent in him. Luckily, Top Nunu is still rare, and you have plenty of ways to stop his ult.
Don't let him get in range to deal True Damage and you'll be fine. Pre-6, this should never happen. Dodge Axes as best as you can, and poke him back hard. Once he gets his ult, be more cautious in your play but still continue to hit him. If he ults and starts running at you, Whimsy yourself and back off till the ult is gone.
He'll spear harass you a lot early. It can hurt. Hurt him back. Make sure that for every Glitterlance you land, you also land at least 2 Autoattacks. If you can outharass him early, you can kill him early and snowball the lane to victory. If you can't keep up with those spears though, the lane becomes a little harder. Back off before you get too low, and try to safely harass with Glitterlance. Only auto him if his spear is on cooldown.
Note: His passive can block your autoattack damage, but won't block Pix's 3 bolts. If he somehow gets his passive off between your attack and the bolts, the shield will block a single Pix bolt.
Her passive makes her deceptively tanky, but her gap closer + harass on you is too mana costly for her to do much. Poke her down, and don't let yourself get Charged into a wall. Don't tower dive her without Ignite; her passive can reduce all your damage by up to 50%.
No real answer to your harass. Don't let him casually get in range to Spin you; force him to use his Dash if he wants to get in range. With his dash on cooldown, he's open to a ton of harass.
He has a nice snare and gap closer, and has some mediocre sustain. Keep those side bushes warded if he enjoys jumping on you, and poke when he goes to kill creeps. Be sure to Help, Pix! him if he ults so you can cancel out his invisibility.
Has a shield and a whopping 4 gap closers coupled with +20 base movement speed over you. If she ever decides to start dashing towards you, be prepared to lose large chunks of life. Play extremely safe, and call for jungle ganks - her early damage is absurdely higher than yours. Get a seeker's armguard if you have early troubles. Once you get Wit's End and aren't behind in lane, you'll be able to kite+duel her a lot more effectively.
His spears and flames hurt. He has a shield. Still not too bad. Don't let him get in range of Flamethrower, and dodge / stay behind creeps to avoid Spear damage. If you aren't ahead of him by the time the ults come out, play a little more passively; his combo has a lot of potential
He has some decent damage output, but he's pretty squishy and doesn't have any sustain. Glitterlance has a longer range than any of his abilities, and you can autoattack him while you're snared. Don't underestimate him too much though; he can spam his spells more than you can. Watch your mana, and avoid confrontation when its getting low.
Poke him down every time he goes to CS, and don't let him harass you without taking more damage back. Dodge his taunts as best as you can; his autos + passive can hurt. You probably won't be able to kill him without jungle aid pre-Wit's End. If you see him ulting to an ally, Whimsy him immediately.
No ranged harass and no sustain. What can he do to you? Fling you? Whimsy yourself and get out of range. Goop you? Glitterlance slow still prevents him from getting in range. Just stay on your toes, because if he ever does actually fling you, you can take a good chunk of damage.
He can poke you back, and auto you back. If he lands his snare on you, his damage output exceeds yours. Avoid his snare and try to poke him down from long range so he doesn't get his ult hitting you, and you'll have a better shot of matching him. If your jungler can pull off a successful gank early, you can easily snowball over this guy. Note: His ult will still be going off if you Whimsy him.
You can outpoke him, and his all-in prevents him from being able to escape the wrath of Lulu. Get your Help, Pix! off on him before he ults so you can still see him. If you find yourself unable to kill him, get the jungler to gank so you can ensure the assassin has no chance of getting fed.
Ward bushes. Know where he puts his mushrooms. Don't walk on mushrooms.
His auto harass hurts, but you have more range. If he blinds you, don't waste your time hitting him with autoattacks. Match his harass as best as you can, and use your Glitterlance range to your advantage.
Note: His blind will prevent your autoattacks from hurting him, but Pix's 3 bolts will still hurt him.
His sustain is decent, and a crit or two on you can lead to a lost lane. If he spins towards you, slow him. He goes for creeps, poke him. Don't do a stupid tower dive if he still has his ult, and don't let him hit multiple autoattacks on you. If he kills you early, play extremely safe; a snowballing Tryndamere is a terror to your team. Get a seeker's armguard / ninja tabi if he gets an early kill, and try to prevent him from getting any more.
Don't engage him before you've gotten your Whimsy, his tiger stance damage is absurdly high in the beginning of the game. Poke him when he last hits, Glitterlance him when he goes Bear.
She has pretty crazy damage. Don't let her get a 3rd shot on you; kite her around before it can happen. Make sure to poke her down hard when she goes to CS, and you'll be alright. Her burst and chasing power at 6 is high, so don't find yourself suddenly at half hp before an engage with her.
Vladimir is a very weak champion early. Capitalize on this, and smash him down before he can get his Revolver and his massive sustain. His poke is pathetic early and he lacks tankiness; all-in him before level 5 and he has no answer to you.
If he ults you, just back off until the debuff goes away. Don't let him draw you into a fight you don't want to be in.
If he dashes towards you to Fling you, Glitterlance and kite . If he can't Fling you, he can't hurt you. Don't do a stupid tower-dive when his passive is still up. If you do find yourself in melee range of this guy, get him off you immediately; you will never win a trade with him if he gets to Bite you.
Note: His early damage his huge, and your kite at these levels (1-3) are low. Don't really get aggressive until you've gotten Whimsy and wards up.
Poor Wukong; his Decoy is rendered 100% useless with your Help, Pix!. With his ability to safely harass you gone, he's like a Fiora without sticking power. Poke and kill as you please.
Once he gets his ult, play a little more cautiously; his combo can hurt pretty bad. He'll also still be spinning if you Whimsy him during his ult. Don't all-in him unless you have an HP advantage even if you're ahead in lane.
This guy is a pain. High damage, decent sustain, with a good gap closer and CC. Try to kite him well enough when he dashes to prevent the third hit of his Q to prevent the knockup, and you can hold your own. Call your jungler over ASAP, you won't be able to stand up to this guy alone.
Tons of sustain, and his poke hurts. Your best chance at winning this lane is winning it early; spam your Glitterlance off every cooldown at him and try to kill him at Level 3. Your goal is to kill him before your mana gets depleted. If you can do this, use your money advantage to start pulling ahead, and keep spamming Glitterlance as often as possible.
If you cannot outpoke him, try to make it a farm lane. Don't try to half-ass poke, he'll just shrug it off. Save your mana, and just get the farm you can. He shouldn't ever kill you if you're smart about backing off and recalling.
Decent sustain, but he can't touch you without his jump - which leaves him extremely open to ganks. If you notice him using it to try to harass you, call for easy jungle ganks. If he doesn't, be prepared for an extremely easy lane ahead of you. You can outduel him, and he cannot outsustain your harass.
His dash has a high cooldown, but he can dish out some pain when he wants. Dodge his Shurikens and focus your harass on him when that shadow dash is on cooldown so he'll have no answer to you. If he ults you, back off. Wild Growth, Whimsy him, Glitterlance him; Survive his crazy burst and you'll win the fight. Kite as best as you can so you stay out of his Spin range.