Bond by blood

Rajin Bio

(The whole thing of Izuku and Rajin getting shot with the quirk erasing bullets were cause I made them to strong and I used logic to make it believable how their main quirks didn't get erased.)
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Name: Rajin Itadori

Age: 17

Height: 6.3

(Shorten the hair)

Air Cannon
Type: Emitter

Air Cannon allows the user to release a devastating shockwave of air pressure from the palm of their hands. This shockwave of air pressure can cause extreme damage to inanimate objects and also knock back  and even damage a person with enough power. In addition to the palm, the user can also release this shockwave from their entire arm allowing for a wider attack area.

Drawback:
The compressed air can also affect the user, causing immense pain on the user's hands, due to how much air is concentrated within them. May also burn/bruise the user's hands if too concentrated, or may even cause a fatal reaction if too much is compressed.
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Post awaken and evolution quirk:

Air Pressure Cannon
Type: Emitter/Transformation

In addition to the amplified power of the quirk the user gains the secondary ability of being able to concentrate the shockwave in a single point as opposed to spreading it out I front of their palm. This allows for the ability to fire off projectiles in a much more precise manner.

Quirk mutations
Enhanced strength, speed, jump, reaction speed, pain tolerance and durability.

Cursed Technique: Thunderclap

Grade: Semi-1

The user can produce a sound that resembles the sound of a roar of thunder that can come from their fists, legs, or mouth. This thunderclap can be used to cause powerful concussive impacts.

Cursed Technique: Hydrapressure

Cursed Object: Hydra Water Flask

Grade: Special

The user can turn their cursed energy into pressurized water with a high density that can damage opponents, but the water is difficult to guide but can still be shot in one direction.

Side abilities learned
Reverse Technique
Can reverse their energy to heal themselves and others but is only a quarter as effective on others. Can also reverse how the users quirk.

Black flash
When user attacks theirs a chance that a black flash will trigger and when one happens their users energy flashes black and red and will do 2.5 times as much damage then normal.

Simple Domain

(The awakening and evolution of the quirk will be revealed in the story)