Nidalee

Strengths

Use brush to your advantage! Moving in and out of brush can heavily alter your effectiveness in battle.
Start team fights by harassing with your Javelin Toss, and then switch to cougar form to chase down Hunted targets.
Bushwhack traps deal damage based on their victim's current Health. Set them up in your team's backline before fights break out during sieges to help your team deal damage to the enemy frontline.

Passive · Prowl — Moving through brush increases Nidalee's Move Speed by 10% for 2 seconds, increased to 30% toward visible enemy champions within 1400 range. Hitting champions or monsters with Javelin Toss or Bushwhack triggers a Hunt, granting True Sight of them for 4 seconds. During this time, Nidalee gains 10% Move Speed (increased to 30% toward the Hunted target) and her Takedown and Pounce are enhanced against them.
Q · Javelin Toss / Takedown — In human form, Nidalee throws a spiked javelin at her target that gains damage as it flies. As a cougar, her next attack will attempt to fatally wound her target, dealing more damage the less life they have.
W · Bushwhack / Pounce — In human form, Nidalee lays a trap for unwary opponents that, when sprung, damages and reveals its target. As a cougar, she jumps in a direction, dealing damage in an area where she lands.
E · Primal Surge / Swipe — In human form, Nidalee channels the spirit of the cougar to heal her allies and imbue them with Attack Speed for a short duration. As a cougar, she claws in a direction, dealing damage to enemies in front of her.
Ultimate · Aspect Of The Cougar — Nidalee transforms into a cougar, gaining new abilities.

A suggested 5-lane lineup built around Nidalee, based on hero partnerships and role synergy — not win rate.