Dart Monkey: Throws a single dart at nearby Bloons. Short range and low pierce but cheap.
Boomerang Monkey: Hurls a boomerang that follows a curved path. Good range and pierce.
Bomb Shooter: Launches a powerful bomb at the Bloons. Slow rate of fire but affects a radius around the explosion.
Tack Shooter: Shoots a short-range volley of sharp tacks in 8 directions.
Ice Monkey: Freezes and pops nearby Bloons for a short time. Frozen Bloons are immune to sharp damage. Can't freeze White, Zebra, or Lead Bloons
Glue Monkey: Shoots a blob of sticky glue that slows Bloons down by 50%.
Sniper Monkey: Can shoot Bloons it can see anywhere on the screen with a long-range rifle, and pops 2 layers off Bloons hit by it.
Monkey Sub: Shoots homing torp-e-darts at nearby Bloons. Must be placed in water.
Monkey Buccaneer: Shoots a single, heavy dart from both sides of the ship. Must be placed in water.
Monkey Ace: Flies above the ground shooting volleys of high-pierce darts.
Heli Pilot: Hovers wherever you direct it. Shoots from twin heavy dart guns.
Mortar Monkey: Launches an exploding mortar shell to a fixed location anywhere on the screen.
Dartling Gunner: Uses a dart-shooting machine-gun. Aims wherever you point on the screen.
Wizard Monkey: Hurls magical bolts of energy at the Bloons. Can upgrade to a variety of powerful spells.
Super Monkey: Throws hundreds of darts at hypersonic speed with a huge attack range.
Ninja Monkey: Stealthy and fast Monkey that throws bladed shurikens to pop the Bloons. Can target Camo Bloons.
Alchemist: Harnessing powers of science and magic, splashes Bloons with acid, also brews varius potions with different effects.
Druid: Creates a blast of thorns for each attack. Upgrades can call forth powers of the Jungle, Storm, or Wrath.
Banana Farm: Generates Bananas each round that convert into game money to spend on more stuff.
Spike Factory: Automatically generates piles of Road Spikes on the nearby track. Excellent last line of defense.
Monkey Village: Hub of Monkey industry, has a number of different benefits to aid all of your Monkeys. Increases range of all monkeys in its radius by 10%.
Engineer Monkey: Holds a trusty nail-gun to pop the Bloons. Can upgrade to create its own nail-shooting sentry turrets.
Beast Handler: Trains land, water, or air beasts. Multiple Beast Handlers can have their own beasts, or combine efforts to train a single beast with greater beast power.