M.E.C.H.A.

The M.E.C.H.A. (Massive Egregiously meCHanical Airship) is a rather fast-moving (about as fast as a green bloon) semi-blimp that adheres to a vehicular concept everyone holds dear: the humongous mecha! It has 2500 HP (as well as 1 AD. :|) and contains five Commando Bloons. Also, it is immune to sharp objects.

Abilities

 * Stomp: Because it's a humongous mecha, it has to have legs and feet, right? Also, those will tend to do quite a bit of damage. So, we have this. Basically, the M.E.C.H.A. stomps on a tower. Stomping will deal 75% of a towers max HP worth of damage to that tower, rounded up to the nearest whole number (for example: a bomb shooter will take 15 HP damage, while a dart monkey will take 8 HP damage). Buildings only take 45% damage, and Giant Buildings and Flying towers don't take any damage at all.
 * Main Cannon: Fires a bomb out that deals 25 HP damage in an area the size of a Pineapple explosion.
 * Machine Gun: Blah blah blah... Exactly the same as the Blimp-based Fighter's and A.Y.A.K.O.'s, except that each bullet deals 5 HP damage (Mecha > Bombers > Fighters).
 * Rocket Punch: (Only used when at 50% HP, because robot hands are an absolute b**ch to replace!) Fires off its free hand, which deals 10 HP damage, but will damage ALL towers it hits!
 * This is a D.R.I.L.L.: Spawns a D.R.I.L.L.

Trivia

 * I'll do a picture as soon as I can.
 * Two of the abilities are more Super Robot weapons, but the other three are more Real Robot weapons.
 * The BGM for when you are fighting this is The Legendary Titan. (Because Hisoutensoku (the robot in the picture) is a humongous mecha, like this.)