Nidalee (the bestrial huntress) Build - League Of Legends (LOL)

There are few dwellers, let alone champions, residing in the blasted and dangerous lands that lie south of the Great barrier. Much of that world still bears the scars of past Rune Wars, especially the mysterious Kumungu Jungle. There are long-forgotten treasures in these strange places which many risk life and limb to acquire. The champion known as Nidalee was only a young girl travelling with her treasure-seeking parents when they lost their way in the dense, rainy jungles. The jungle was unforgiving, and she watched her parents suffer agonizing final days at they fell victim to a mysterious and vicious disease. As improbable as it was for a child to survive in the inhospitable jungle by herself, she did just that. Her youthful innocence and a fortunate naivete caused her to appeal to the beasts of that place and she was taken in by a family of cougars and raised as one of their own. She grew and somehow absorbed the raw magic of the dense wilds, evolving beyond both her human physiology and her feline affectation. On one pivotal day in her life, standing over the torn remnants of a Noxian squad of woodcutters, Nidalee chose to rejoin the so-called civilized world, to fight in the League of Legends so as to protect the vast woods from both Demacia and Noxus. Nidalee was taught to fight by her feline family, battling viciously with tool and nail. Something in her feline ways may draw you to her, but remember that she is no pussycat. 

Masteries + Runes

Marks - 9x +1.96 Armor Penetration
Seals - 9x +0.75% Dodge
Glyphs- 9x +0.27 health regen / 5 sec.
Quints- 3x +1.5% Dodge

Of course Crit Chance is always welcome for almost any character. Mana Regen is a welcome substitute for the health regen as well, however the Dodge I feel is something that is more of a "Key" element. 

Abilities

Prowl

Moving through brush increases Nidalee's movement speed by 25% for 2 seconds. "Please keep in mind, that the 2 seconds, only applies when you LEAVE the bushed area. So make sure to run completely through it for escaping/ganking. Keeping this one minor trick in mind, you can really save yourself allowing you to play a little more aggressive."

Javelin Toss / Takedown

Human: Nidalee tosses her javelin, dealing 55/95/140/185/215 (+ ability power) magic damage on impact (deals up to 250% damage the further away the target is). Cougar: Nidalee's next attack deals an additional 40/70/100 damage (with up to a 200% multiplier the lower her opponent's life is). "Human - This move is your pride and joy. Once you learn how to anticipate your enemies movements, this skill will undoubtedly land you the killing blow on characters with enhanced speed. (Yi, Udyr, Teemo and Ghost ability.) Cougar - The key here is "Next Attack" This means you can activate it, POUNCE, and then the move is used to get that killing blow. If you can get in the habit of triggering this just before you pounce, you'll find yourself often finishing where you otherwise would need a another pounce or two."

Bushwhack / Pounce

Human: Nidalee lays a trap that deals 80/125/170/215/260 (+ ability power) damage over 2 seconds and reveals the target for 12 seconds. Champion armor and magic resistance is reduced by 20/25/30/35/40% for the duration. Traps last for 4 minutes. Cougar: Nidalee lunges forward, dealing 125/175/225 (+ ability power) magic damage to surrounding enemies. "Human - Bushwhack does exactly as its name implies. With this ability, you can greatly reduce your fear of the bush. Paying attention to where you enemies tend to enter from, you can place a trap right at those locations to help push them out, and if they don't, a good Javelin toss will scare them away. Cougar - This is your PRIMARY cougar ability. Whenever Possible, Pounce. It has a wide variety of uses. The most obvious being chasing and fleeing. But when facing opponents who are trying to 1on1 you, if your constantly pouncing back and forth, not only are you doing the damage, your making yourself harder to target with abilities and skill shot moves! And don't forget, you can jump small ledges with pounce, giving you a great advantage."

Primal Surge / Swipe

Human: Nidalee heals an ally champion for 75/120/165/210/255(+ ability power) and grants a 20/30/40/50/60% attack speed for 8 seconds. Cougar: Nidalee claws at enemies in front of her, dealing 150/225/300 (+ ability power) magic damage. "Human - For a majority of the first portion of the match you will most likely use this a lot. Keep in mind this is also an attack speed buff, Which cast just before cougar shift, can give you a good start to the fight, specially with life steal and eager casters wanting to waste abilities. Don't be a hog, heal your lane mate, this will greatly help you out having them stay there longer. Cougar - Great source of Damage in a fight, specially team fights. This + Pounce is also a great way to kill off a massive wave of creeps for quick Gold."

Aspect Of The Cougar

Nidalee transforms into a vicious cougar, gaining 20 movement speed, 10% dodge, and a new set of abilities. "The most important thing to remember about Cougar form, is that the shift, as well as all abilities cost NO MANA! So don't be afraid to pop off your moves in Human form!! As you can see you get a minor movement speed and a beautiful +10% Dodge. When fleeing and chasing, do the majority in Cougar form. The speed bonus + Pounce will give you a great advantage, and AIM for bushes if you can. But most important, don't be predictable with your routes!"

Skill Order

This skill order heavily favors Primal Surge, because it is nice to be aggressive early on and the level 3 Javelin Toss is effective for the most part to last.
 

Summoner Abilities

Cleanse
I take cleanse over Exhaust because with the total speed, Prowl and Pounce in the mix, on top of Frozen Mallet, them out running is rare.

Flash
Flash is useful for both Offensive and Defensive reasons. Can give you that extra push in cougar to get them if they flash themselves, can save you deeply when used with Cleanse when caught by the other team.

Items

Building up is solely based on how much Gold your earning from last hits and kills. So better gather much gold as possible.

Starting Items

Buy Meki Pendant

Buy Health Potion x2

Buy Philosopher's Stone

Buy Ninja Tabi

Buy Stark's Fervor

Buy Phantom Dancer

Which order to buy these two items is up to you, depends on how your match is going. If your falling behind in damage, I recommend the Infinity, however because your main damage is your abilities, the Frozen Mallet is my personal choice before hand. Health + Slow is nice.

Buy Frozen Mallet

or

Buy Infinity Edge

Sell Philosopher's Stone

Buy Banshee's Veil

Generally, if the match goes that long, adding in Banshee's to help with some of those pesky moves that champions use to start the encounter.

Final Build

 Important Things To Consider

Lane- Stick to top or bottom lanes to start, the bush will give you a good chance to run up and get behind enemies early on. TALK to your lane mate, communicate for ganks, ping your targets. Primal Surge can be used for both of you so if they are melee, don't be afraid to give them the heal, it pays off. Keep a fair distance, and use Javelin toss to harass OFTEN, don't get annoyed at periods of low mana due to using a lot of Primal Surge. Remember it is an Attack Speed buff as well. Using Primal Surge on yourself just before attacking a tower, is a great tactic to help bring in that gold for your team.

Cougar is meant to be used for ganking mostly, so use your range to control the lane, your long range skill shot and heal will be most effective at this. Try and keep at least a Bushwhack in the little bush patch coming from river, this can save you and your lane mates lives! After level 11, when Cougars abilities gain the second damage boost, feel free to really start ganking now, you should be quite capable at assisting other lanes at this point for tower pushes and defending.

Team Fights- In team fights, try to always Pounce into the fight, spam abilities as soon as they are off cooldown, remember they have no Mana cost, so don't be afraid to spam some heals and Javelin throws. Pounce out if you need a quick heal, or to throw your Javelin to finish off a fleeing target. Be aware of creep paths, it will effect your Javelin throws. Otherwise just focus fire with your team if possible, your dodge will make it easier to take on Melee heroes, however casters are still able to inflect a chunk of damage, but generally are squishy enough that you can start off cougar, go human, heal and finish them off.