Caldawar (Diablo 2 Druid) by Pickly

Level 1:

Howling winds: Quest. Last hit 40 enemies with tornado. Each enemy last hit increases Tornado's damage by .25% Reward. Tornado slows enemies it hits by 50% for 1 second.
Lycanthropy: Druid gains 10 spell armor in bear form.
Wolf feast: wolves gain 1% damage when something dies near them, up to 10% increased damage, for 5 seconds.

Level 4:

Funnel Cloud: Tornado travels 10% farther
Pack Leader: If all 3 dire wolves have survived for at least 5 seconds, the druid starts regenerating health 3x as fast.
Strength of the Oak: Increases the oak spirit's hit points by 20%

level 7:

Carrion Vine: Everything (except druid's own summons) that dies near the druid gives back 1% of the druid's maximum hit points, plus 1% of the hit points of whatever died.
Brambles: Anything that is effected by oak spirit's aura reflects 10% of incoming base attack damage
Hungry Wolves: Druid animal summons lifesteal 10% of their damage.

Level 10:

Hurricane/Hunger: The druid surrounds itself with a hurricane. In bear form, can lifesteal occasionally with hunger. Enhances the AoE spellcaster side of the druid.
Grizzly: Allows the druid to summon a grizzly bear in both forms, and enhances the druid's other summons. Specializes the druid towards summoning.
Shockwave: Gives the druid a powerful stun in bear form. In human form, gives some protection from spell damage. Enhances druid attack damage, and specializes the druid towards bear form.

Level 13:

Solar Creeper: Everything apart from the druid's summons that dies near the drui gives the druid back 1% of the druid's maximum mana, plus man equal to 1% of the hit points of what died.
Twister: Sends 2 smaller tornados off to the side of the main one. These tornados dead 1/2 the damage in 1/2 the width.
Fire claws: increases the druid's base attack damage by 50%, at the cost of 10 mana per hit. Only usable in bear form.
Spirit wolves: Summons a pair of 2 extra wolves. These wolves deal half the damage and have half the hit points of dire wolves, and are effected by dire wolf talents.

Level 16:

Wolverine spirit: For 10 seconds, the oak spirit also increases attack and ability damage. Turns the spirit red. 60 second cooldown.
Raven Flock: summons a flock of ravens that lasts 10 seconds. The ravens fly quickly, target the closest heroes, closest buildings if no heroes, than mercs and buildings. attacks deal some damage and have a chance to blind, causing the next attack to miss. 60 second cooldown.
Feral Rage: Whenever the druid takes or deals damage, it gains a 2% speed increase, up to 20%.
Arctic Blast: Tornado slows enemy move and attack speeds by 10% when it hits, stacking up to 30%. Effect lasts up to 5 seconds.
Mauling: using maul causes the next druid basic attack to stun for .5 seconds.

Level 20:

Typhoons: Hurricane cooldown reduces to 45 seconds, Tornado cooldown reduced to 2 seconds, mana cost reduced by a third.
Forest Predators: the maximum number of dire wolves is increased to 5, and the bonus to animal summon's damage and hit points is doubled.
Seismic wave: the stun in shockwave is increased to 1.5 seconds, and maul's cooldown is reduced to 3 seconds.
Alpha Wolf: The druid gains 7% attack and ability damage for every summoned creature it is maintaining.
Wolf Run: The Druid and his wummons move 30% faster for 10 seconds. 60 second cooldown.

Interactions

Malfurion: "A fellow druid. how are the wilds doing in your world?"
Druid: "A demonic invasion has harmed them, but they are resilient"
Malfurion: "Our world has suffered the same."

Druid: "A fellow druid. What animal can you shift into?"
Malfurion: "Alas, i do not take the form of an animal. My fellow druids choose differently."

Greymane: "Were you cursed like I was, or did you chose to change into an animal."
Druid: "I chose to master the skill of shifting. We have defended our lands this way for centuries."

Thrall: "We will bring the elements against our enemy."
Druid: "The whirlwinds obey my command."

Druid: "I change into a bear. your totem is a ...rabbit?'
D.Va. "Totem? ha ha, no ,this is just my mech."

Kills an enemy

Ragnaros: "Return to ash, creature of lava."

Sgt. Hammer: "Even the biggest machine returns to the earth."

Zerg: "I have never seen such a creature in my travels."

Arthas: "Your poison will fade in time."

Killed

Tychus: "Nature freaks. Good riddance."

Rexxar: "You know nothing of the wilds."

Abathur: "Zerg. evolved. Wolves and Bears. Random. Unplanned"

Dehaka: "Essence of human or bear? Still. useful."

Clicked on often

"It is sad to hear of Arreat. Though we were separated long ago, the barbarians are still our brothers."

"Wolves and bears are quitepopular among shifters."

"Cats? I must learn this."

"Imagine what an ultralisk could do to the demons in my world."