Camaris (Diablo 2 Assassin) by Pickly

Level 1:

Fast Traps: Halves the cast time of traps.
Dojo Training: Quest. Each combo point spent to damage a hero increases the Assassin's base damage by .1%. Reward: at a 5% increase, Assassin abilities that use combo points gain an extra 3% boost per point from them.
Fiery kick: Raises the AoE fraction of Dragon Kick by 5%.

Level 4:

Viz'taqaar preparation; gives the assassin 3 combo points. 60 second cooldown.
Charged Bolts: If enemies are close to a shock trap, the trap's damage is increased.
Mage Killer: Every 10 seconds, build an extra combo point if your basic attacks hit an enemy within .5 seconds of that enemy using an ability.

Level 7:

Well Built Traps: Raises trap duration by 2 seconds.
Shadow Aid: If the assassin is below 30% health and uses fade, fade heals a small amount over its duration.
Evasive fading: Stuns and roots during fade will slow by 50%, slows are halved.

Level 10:

Lightning Sentry: Adds more powerful, piercing traps. The assassin becomes a trap caster from long range, defending an area.
Blade Sentinel: The assassin becomes a ranged attacker. Provides the assasin with a longer range damage ability.
Dragon Flight: The assasin can leap to enemies to hurt them. Assasin abilities also slow nearby enemies.

Level 13:

Spell Shield: Same as all heroes. Reduces damage from abilities, stores up charges.
Venom: The next basic attack or dragon attack will poison an enemy, dealing a large amount of damage over 5 seconds. 60 second cooldown.
Weapon Block: While the assassin is attacking an enemy, will block 20% of basic attacks.
Mind Blast: Stuns enemies in an area for .25 seconds. 60 second cooldown.

Level 16:

Cobra strike: The next assasin ability that uses combo points heals the assassin for 50% of the total damage dealt. 60 second cooldown.
Blade Shield: Surrounds the assassin with a shield of rotating blades that reduces incoming attack damage, and damages melee attackers. 60 second cooldown.
Shadow Master: Summons a copy of you for 10 seconds. This copy is AI controlled, and uses whatever spells you have, for half the effect. Lasts 10 seconds. 60 second cooldown. While active, can control who the warrior targets.

Level 20:

Death Sentry: Up to 5 lightning sentries can be created. Every 10 seconds, Whenever one of your lighting sentries strikes anything and kills it, deal 50% of its HP for minions, and 20% of its HP for heroes, as AoE damage at the site of death.
Blade Fury: Increases the duration and damage of the sentinel.
Dragon claw: If Dragon Flight kills an enemy, the cooldown is reduces to 2 seconds.
Fade In and Out: Fade can store up to 2 charges.
Fade Completely: Using Fade Stealths the Assassin for 10 seconds. 30 second cooldown.

Interactions

Assassin: "I apologize for killing youre mentor, Li-Ming. it was not how i wanted it to end."
li-Ming: "Let's not talk about it."

Nova: "another assassin? Count kills, compare at the end."
Assassin: "I like this competition."

Thrall: "A corrupt mage killer? We could use you in our world."
Assassin: "so i have heard."

Assassin: "In battle, I strike when you least expect."
Valeera: "My kind of ally."

Gazlowe: "Say, how do you build those traps so no one attacks em?"
Assassin: "Just our hidden techniques."

Kills an Enemy

Gul'dan, Kael'thas, etc.: "A corrupt mage meets their fate at my hands."

Abathur: "The creator of monstrosities is defeated."

Tracer: "I can even catch you."

Leoric: "dark King, return to your grave."

Killed

Genji: "You technigue could use...improvement"

Alarak: "Terran martial arts and magic traps? How pathetic."

Raynor: "Assassins? Lose every time in the open."

Li-Ming: "That was for Isendra."

Quotes

"How do my traps make lightning, anyway?"

"I strike from the shadows. Well, not really, I don't have stealth. It's just an expression."

"Traps and martial arts are a strange combination, who came up with that?"

"I don't just ***ainate mages, i can kill anyone, really."