A.A.B.A.

(AABA Abiding Blimp of Ancronym) is a patterned blimp with 1121 HP, spawns 3 MOABs and 1 BFB on defeat, and moves as fast as a BFB. It likes making fractals everywhere.

Abilities
Because of its addiction to fractals, all his abilities are used in a ABACABA pattern. That is, it uses the first ability, then the second, and the third like a binary counter. The interval of each abilities is 7 seconds.

AABA(A)
Shoots a bullet that travels with 70 pixels per second speed, and divides into four smaller bullets with AABA pattern.

The A bullets will further divide into AABA bullets like the whole bullet, until it goes offscreen. It can pierce towers and deal 2 damage and give them AABA (Status effect) on contact. The B bullets will travel in a 120 pixels per second speed, and guides at tower, dealing 5 damage to them.

Sierpinski's triangle(B)
Shoots a solid triangle that covers the whole screen, then every $$\frac{1}{\sum^n_{i=1}n}$$ seconds the middle of the triangle falls down and hits randomly on the track, dealing $$\frac{30}{\text{iteration}}$$ damage to towers. The attack lasts for 5 iterations.

B bullets that is still on screen during this ability will turn into smaller 3-iterational triangles that has the same mechanics as the main attack.

T square(C)
Shoots a C bullet that splits diagonally into 4 smaller C bullets 0.5 seconds after spawning that repeats the pattern and deals 1 damage to towers. The whole attack lasts for 8 iterations.

Trivia

 * Random idea when I saw RRAB.
 * I would please Wacky to Fraxize those attacks if possible.