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I have a small list, and here they are.

Raging Sword: This ability allows the captain to the soldier the ability to use a powerful rage like slash, which can break through any defenses. The big problem about it is, we can only use it so many times while in combat, and depending on your rank, it should be a last resort type ability.
For soldiers, it is a one time use, it will allow you to slash right through, but not exactly breaking the enemies zanpakuto, and cause critical damage, back drop is you lose all energy while doing such.
The officers gain the ability to use it twice, the back drop of using it once, is temporary blindness of the left eye, and numbness of the left hand. The third time you will be completely out of energy.
For the Lieutenant it is three uses, first use does nothing, second use goes blind and numb on left side, third use is loss of all energy.
Captain four times, first time nothing, second time a slight tingle in the left arm, third time is numbness of the left side, and finally loss of all
energy.


Hidden strength: This ability has no true draw back besides the fact it can't be used more than once per battle.
Hidden strength gives a temporary explosion of reiatsu, doubling the power of the member. It is not like when Reddeye removes his necklace, no this is more like a rage form of power. Depending on the rank, depends on the allowed use of this ability.
Soldier for four turns the soldier is able to go into the hidden strength mode which adds a blackish like reiatsu over their already colored reiatsu, giving the soldier double the strength they already have.
Officer: for five turns the Officer gains a black reiatsu over their already colored reiatsu, doubling their strength for four turns.
Lieutenant: for six turns the Lieutenant gains double their strengths, with a black reiatsu covering their already colored reiatsu.
Captain: for seven turns the Captain gains double their strength, with a black reiatsu coverng their already colored reiatsu.

This ability makes the lower level alot stronger, but not exactly truly able to defeat higher levels, it all depends on how they use it of course.

Squad 11 immunity: This is a rather simple ability. For a set amount of turns, the insanity of squad 11 kicks in, allowing them to be immune to attacks for a set amount of time.
Soldiers: two turns, then can't be used again in battle.
Officers: three turns, then can't be used again in battle.
Lieutenant: Four turns, then can't be used again in battle.
Captain: Five turns, then can't be used again in battle.

Exploding Blade: This ability causes the blade of the shinigami's zanpakuto to act like a bomb for set amount of turns. The ability does not harm the shinigami, but does take some energy. The ability can only be used if they are in the maximum form, (Excluding vizard masks) such as if they have bankai, they must be in bankai, if they only have shikai, they must be in shikai.
The zanpakuto gets covered in red particles, and can explode in a dangerous way. If the opponent blocks the attack, they are still dealt damage, but if the blade makes contact to their body, it can deal double to even triple the damage.
Soldiers: gain this ability for two turns
Officers: gain this ability for three turns
Lieutenant: gain this ability for four turns
Captain: gain this ability for five turns

While using this ability, each person in the battle must do a random number. The setting will be made from 1 to 100.
If the user of this ability has made it over 60, it is a direct hit to the body, now here is the catch, if the other person has made over the person's number by ten the damage is only double if on physical, but if they are twenty points over the enemy, it deals regular damage.
Now if the user is 20 points over the defender, they deal triple damage.
if the attack is from 59, and under, it is a block able attack.
from a range of 1 to 26 it can be dogged, but from 27 to 59 it can only be blocked.

That is my list, hope you all enjoy it.

I approve. I need to think of an ability.

Ah sorry. "Hidden Strength"

Need more votes please.

Majority say hidden strength, so I am going with that.