Support

Chain of replenish mana
Detonation beam: can move while channeling, damages enemy units (primary attack)
Fortify structure: and ancients
Lightning shield: can apply to allies and enemies.

Mobility Assassin

Teleport Entry and Teleport Exit: maintain a one-way portal through which all allies can enter.
Blink: become invisible. After a short wait, teleport to the target point. Invisibility is maintained for a few more seconds. If you attack in that time, the damage is increased.
Backstab: passively deals double damage after a precise attack from behind. Can only occur after not attacking for a time, or after resetting cooldowns.
Reset cooldowns: reset other cooldowns and instantly recharges the teleportation portal.

Hybrid Carry

Agi primary.

Lava Ball: channel to increase size of this projectile. Damage scales with int.
Explosion: delayed AOE damage
Incinerate: Innate. Passive. consecutive attacks deal bonus damage.
Sigil of int: temprarily gains huge bonus int at the cost of agi.
Sigil of agi: temporarily gains huge bonus agi at the cost of int and mana.

Wisp Master

Aura of Wisps: Every 16/12/8 seconds, spawn a wisp which follows Ghost - up to maximum 2/3/4.
Howl of the Banshee: line damage with art effects like banshees
Command: detonate: all owned inactive wisps detonate at the target area, dealing damage and mana burn.
Mind control: an inactive wisp begins channeling to mind-control an enemy unit (as long as channeling persists, up to 3 minutes). Effects when the 3 minutes is nearly up.
Ancient: orders one of the inactive wisps to start building an ancient protector. Permanent.

Avatar Bruiser

Illidan's innate passive is avatar, which transforms him to and from a powerful morphed variant with extra armor, health, and health regeneration. Illidan can't control his transformation - it happens periodically.

Normal: ranged carry
Avatar: melee bruiser

Normal:

• Dash: low cooldown ability that makes the next order a dash.
• Berserk: low cooldown ability that makes attacks occur in quick succession, but takes more damage when hit.
• Healmore: Illidan heals himself for a large amount of health.

Avatar:

• Fan of Chaos: like fan of knives, but uses the ranged projectile of Illidan
• Ghoul: attacks much faster for a time, and also steals health on-hit.
• Immolation: drains mana while damaging nearby enemy units.

Tank

Druid form:

Bears have 9 lives: passively gives big bonus health regeneration when below 9% health.
Revive ally: can revive an ally by targeting an item, instantly.
Spirit bear: summon untargetable, uncontrollable spirit bear which survives as long as the druid is nearby.
Bear form

Bear form:

Passive armor bonus both when attacking and when spirit bear is nearby.
Howl of Terror
Siphon life - non-channeling.

Archer Master

Summon archers: passively summons up to 3/4/5 archers to fight at her side. They're controlled by AI.
Trueshot aura
Command: attack: orders summoned archers to attack the target unit or point, for a time.
Blazing arrows: when activated, Tyrande and also her archers get blazing arrows (bonus damage) for a duration.

Bruiser/Fighter?

Looks like spell breaker but not an anti-mage.

Tank

Edges: when activated, 100% of damage is deflected.
Eat tree: consume to gain big health.
Hyperbash: the next basic attack smashes enemy units, dealing AOE damage and knocking all of them back.
Ingrain: becomes immobile and gains huge health regeneration bonus.

Antimage

Dark spears: attacks passively apply a poison that reduces enemy mana. If they have no mana, deals damage instead.
Impetus: 300/500/700 bonus range (she already has 400 range)
Spirit shield: target allied unit becomes spell immune for a time.
Chain of venom: throws a bouncing ball of energy that hits each enemy affected by Dark Spears.

DPS Caster

Spirit phoenix: neutral, uncontrollable pet that occasionally turns into an egg
Banish more: banishes a unit, dealing damage and knocking it back. Deals bonus damage against an already banished unit. 10s duration, 8s cooldown.
Inner fire: applies inner fire to all nearby allies.
Inferno: channels while producing cataclysmic flames in the general target direction, dealing massive damage and slowing enemy units.

AD Carry

Technique: Gains 100/300/500 bonus range
Volleymore: gains bonus attack speed, which persists as long as Naisha doesn't stop attacking.
Dash
Boomerang: Knocks back enemies in a line. Can be retrieved to reset cooldown.

Agi Carry

Invulnerable Carry

Necromancer/Banshee Archer

Summon Skeletons: summons skeletons so that she has 3/4/5 fighting for her
Dark Energy Volley: bonus AS + each attack heals skeletons
Dark Pact: cuts sylvanas' HP to make skeletons significantly strong
Curse More: plants a powerful curse on enemy units in an area. They die when attacked below 10% health, and most of their attacks miss.

Skeleton abilities:

Bone armor: attacks cannot deal more than 1/3 their HP (~100?)
Dark pact: attacks deal % bonus damage

Agi Carry

Bruiser

Aqua Jet: deals spell damage to all in a line; marks them with Water Boarded (starts level 1)
Empowered trident: attacking a Water Boarded unit does bonus damage with execute effects
Summon Tidal Guardian (immobile one)
Bash: when activated, attacking a Water Boarded unit also stuns it, for a time.

Tricky/Unreliable DPS Mage

Moon Crescent: fly in a circle while using a phoenix fire ability
Sparkle Beam: shoot outwards rays like cluster rockets. Longer range and not AoE
Magic Inversion: when activated, attacks deal bonus damage if the enemy has more armor
Dark of the Moon: Can only be cast during the day. Change time to night. Temporarily unlimited mana. Reduced cooldowns.

Monster Master

Arena: bring target enemy unit into an inaccessible arena.
Capture: attempt to capture an enemy unit. More successful if their HP is lower, and if they're feeble, asleep, or rooted. Can only have a few units captured at a time.
Enfeeble: temporarily makes a unit much weaker when attacking Maiv or Maiv's other monsters.
Empower: permanently empower an owned monster.

Captured unit abilities:

• Release: changes the owner back to hostile
• Revive: after dying, leaves an item which Maiv can use to bring it back to life. If the item is destroyed, the unit is released.

Unusual Support

Last wish: innate ability - one time use - fully heals + revives all allies and toilet.
Spirit bond: cast twice. Marked enemies will die together.
Wave of Partitioning: Throws units away from the targeted area, creating a gap.
Entangle Beam: entangles units in a line while channeling.
Temper item: upgrades a target item.

Item tempers:

Circlet: doubles effects
Claws: doubles effects
Gloves: doubles effects
Boots: becomes a charged permanent
Mask: doubles effects
str/agi/int items: doubles effects
...

Chimera Master + Avatar Fighter

Ancient Chimera: summons an uncontrollable, gigantic chimera which attacks nearby enemy units + phoenix fire with acid. The chimera moves in a general direction between attacks until it leaves the map.
Squall: while channeling, deals wind damage in the target area to enemy units.
Impale: launches a target enemy unit into the air after a short duration. If it's hit by squall, the damage and CC are increased.
Raven Form: avatar

Raven:

Whip strike: low cooldown basic attack. Deals bonus damage if the target is further away.
Double strike: low cooldown basic attack non-interrupt. Resets attack cooldown.
Eviscerate: tries to instantly kill a target unit, which must have low hp. If successful, fears nearby enemy units. Deals more damage to units with lower % hp.

Healer

Healing Spray
Orb of venom: when activated, attacks deal poison damage over a short time.
Spirit Link
Tranquility

Caster Carry

Blizzard is primary source of damage
Upgraded Brilliance Aura

Versatile, Amphibious

Ball Lightning: Throws a ball of lightning
Vaccustrike: Wind-powered next attack that deals execute damage.
Aqua Shield: just divine shield
Sing: Mass sleep after channeling 1 second.