I am curious to hear your opinion on the matter.
If a champion were to go all in / cheese at levels 2, 3, and 6, which champion(s) would have a stronger advantage compared to others?
Try to avoid listing that white haired chick that likes cancelling our favorite cartoons and enjoys fighting rabbits who is also rumored to have a love interest made out of flubber.
has a deadly early game.
used to do it on 
all the time, both top lane, can be done on 
but lvl 3 is easier
You wanna all in at level two? He's your guy. Lock on bullshit Q if you land his poison DoT.
has a really strong level 2. Q, E and just keep punching their stupid faces until they recall.
Level 3 I gotta give it to 
. Levels 1 and 2 are terrible but level 3 you can actually go in, deal tons of damage, and get out.
Draven and Kalista got that level 1 powerspike. Lucian has a really strong level 2. Karma has a surprisingly good level 2 as she already has 3 spells. Really good level 3's are LeBlanc ( she has really nice level 2 burst but you often need chain for lethal at 3) Zyra, Zed and Cass also all have pretty good level 3's. The assassin champs have the biggest level 6's
e,auto,q, thunderlords chunks any non tank to 60% from 100% at lvl 2
Level 2 all in
Pretty straightforward, QE Ignite is usually enough to burst someone down if you harassed them level 1 and the whole thing hits
QE is devastating though understandably hard to pull off with how slow Q is (You Q someone and pop it after it passes through the enemy so it deals the damage twice, then E when they're frozen which doubles E's damage)
Guaranteed criticals for executing
if you level W first over E, they have to let you go into melee range though, which doesn't happen often.
Hard to pull off but the sheer burst Graves outputs is noticable even early.
Funny thing is, a champion who has most of his kit's power in one skill can actually have a friggin terrible early all in, even though you'd think logically they'd have an advantage right? Who? 
Quinn has a very strong level 2 powerspike. You have access to both your Q and E, giving you a potential 3 harrier procs in quick succession.
As for level 3 all in: any champion that can combo spells together, especially if they have some kind of CC (Xeratg for example. Stun with E into a quick WQ + Thunderlord's, and that's about half their health)
Level 6 all ins: all champions with a true ultimate that does its effect instantly (think Zed, Katarina, Vayne, Nautilus, etc. basically anyone who isn't a form changer and doesn't have a channeled ult)
. Why? Because Draven!
A that takes his W at level 1 has one of the cheesiest all ins. I've never failed to first-blood a Nasus at level 1 with ignite like this, and I've even seen Dyrus do it in high level play.
is a level 2 king, due to his cheesy crits, good gap closer, high base stats, and free AD from his Q.
is also great for level 2 cheese. Q>E>AA>AA>AA...>AA is pretty broken.
Darius has a strong level 2,3 and 6. Early because bleed gets underestimated a lot and stacks with ignite for a surprising amount of damage that gets underestimated and results in kills (it also works post-flash). 6 because the dunk is huge.
J4, especially in top lane built damage has massive level 6 kill pressure. His full combo is a shit ton of damage and you surprise people with it for kills. Plus, if they do not have a dash, they get to have fun in a box with J4.
Yi has a very powerful level 6, combined with his smite he does a huge amount of damage and if he gets a catch, they are pretty much toast. If he's had a good game thus far, his level 6 can be overbearing and he will have devourer.
Vi has an extremely powerful 6. Her ability to lock you down, do huge damage, and shred armor is really potent. Vi level 6 ganks are very difficult to fight but if you somehow survived laning phase and have a sheen, it's a lot of damage. Her shield doesn't hurt either.
I'm surprised nobody said yet. Tons of early damage and not a lot of room to retaliate when he jumps on you.
Assuming you mean for top lane here is how I personally rank some of them (Earlier listed means they generally are better at it)
Level 2
- probably the most deceptive level 2 power spike, chomp hurts and either frozen domain or pillar will make sure you can keep trading with them. Make sure you prep a grasp of the undying proc and use your Q as an auto reset and not many champs can fight you
- if he has landed a couple Q's on you prior, beware of the E-Q into just straight up murdering you. It is quite a bit stronger than you'd expect.
- if he starts spinning and takes minion aggro, back off, cause that counterstrike damage is going to hurt and he is going to hard win the trade.
- pretty straight forward, his W auto reset and slow makes sure you are going to stay in range for his damage and he can q when you try to back off to get the heal and an extra bleed stack.
- if you are near a wall her E>Q is going to chunk pretty hard, she can pile a lot of damage but it is situational on that wall stun
- should have his Q and E both, and the dude is just going to back off afterwards and heal most of your return damage back up and do it again...and again
- he has to win lane at level 2-3, and he is damn good at it. if you survive though generally he isnt much of a threat after.
Level 3
- Dash in, AA, Stun, Q, AA, Dash back out. likely got a grasp proc in the exchange and if he had his bar high enough that is going to hurt and not much you can do about it
- if he walks into the brush, care for a prepped W stun, his damage is no joke and he gets that shield on top of the stun to help mitigate some return damage
- Some people will say level 2 is Wu's better Powerspike, I disagree with those people. if he puts a 2nd point in his E he hurts
- It is Fizz...except he has a longer lane to play with you in
- likely been poking you, and now has his full combo. if you are low he can all in and very likely secure a kill.
Level 4
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---------all now have their full kits and a 2nd point in their primary ability
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/
Besides the usual suspects:
those guys are the definition of Level 1 cheese in Top-Lane:
: Tiger Full AD -> One Q = 1/3 HP gone at Level 1, just hide in a bush wait for you opponent to last hit and BOOM - back to base.
:Smite Gromp, wait for your opponent to AA you -> EEEEEEEEEEEEEEEEEEEEE, or more usual @2,3 Hit a Q and EEEEEEEEEEEEEEEEEEEEEEEE - same result! xD
: Start with E/Ignite, spin in pray for crits. If RNGesus is kind well you basicly won the game, if he's numb... well RIP! =P
lvl 2
good entrance/escape + boxes
hook + stun = insta death
combos and more combos, in n' out before you notice.
Has nobody said
yet? He can completely murder you at lvl 2 with no effort whatsoever, just w, q, ignite and that's first blood.
I'm surprised, just nobody talked about Katarina, I think she's got best opportunity to cheese on lvl 2,3 and 6.
