Lee Sin the mighty one. His counter jungling prowess, skirmish strength, mobility, and great ult give him all the tools a champion needs to dominate a game. He is however one of the hardest champions to play, given that he has six spells and so many small interactions, combined with a skillshot Q and one of the hardest ults to use in the game. Great Lee Sin's are quite rare for this reason, but seeing it executed properly is truly a sight to behold!

Pros
•Insane mobility
•Very strong counterjungling
•Great ganks, particularly post 6
•Extremely strong skirmish potential
•If played right, insane youtube-worthy plays are a common occurrence


Cons
•Extremely hard to play
•Weak CC
•Must build tanky to be effective in high level play
•Recovers poorly if behind

9x Greater Mark of Attack Damage
9x Greater Seal of Armor
9x Greater Glyph of Magic Resist
3x Greater Quintessence of Attack Damage

The runes are pretty standard for any champion with sustain.

I don't like armor pen anymore since you're playing more of a tanky champ mid-game. AD does more early, especially helpful when clearing creeps.

Armor yellows are standard on all champs - they are just too efficient.

MR blues are also standard, no other runes really keep up in efficiency. I get flat instead of scaling since early game is extremely important for Lee.

We take 9/21/0 if we're doing the tanky build. Remember, always get masteries to match your item build since there are a lot of multipliers in masteries (ex: legendary armor, juggernaut). If you went with the high DMG build, you go offense tree.

Machete/5 is the standard jungle start. No reason to go any different on Lee - machete is just OP on him. Standard for top lee sin is boots unless you need the extra armor with cloth armor.
You definitely want to have at least madred's razor on first back. Upgrade to Wriggle's Lantern and buy Boots of Speed after that, depending on how much gold you have (900 = buy wriggles, less = buy boots). Grab Boots of Mobility and Sightstone afterward. Lee Sin is an aggressive, mobile early game jungler and these items are key for taking control of their jungle.
From there, Locket of the Iron Solari is the most solid defensive items you can buy in current meta. If they have no magic damage, you can skip Locket of the Iron Solari and start on your Sunfire Cape early.
Sunfire Cape and Frozen Mallet are important on Lee Sin to prevent him from going into obscurity late-game. We built all tanky items early/mid game, so our late-game items need to contribute some damage/utility, or we just get ignored.
Last Whisper, Blade of the Ruined King, and Mercurial Scimitar are situation pick-ups. If the enemy is stacking armor, get Last Whisper, otherwise get Blade of the Ruined King for damage. Mercurial Scimitar is really a 6th item meant for if you're getting targeted by heavy CCs.

Note that there is a build running around that began in Korea where you start with Doran's Blade and build into 1-2 more Doran's Blade and Sightstone. If you do this, you need 6% lifesteal quints and do 21/9/0.