Not Born, But Made: Yuri's Progression

Echo Chamber
Rank: E
Description: Around Yuri's forearms are two round, bonelike chambers filled with holes. Air enters these chambers through two ways, one is simply by air coming in through the holes, and the other due to his lungs having tubes that go through his arm and into these chambers and releases air when he moves his arms, the amount depending on the severity he moves them to the point that he can actually create short range air blasts by swinging his arms hard enough. As air rushes out the holes in the chambers, an extremely shrill high decibel whistle is released from them, enough to the point it can actually affect someone's hearing to the point of damaging their inner ear.

Benefits

Vertigo (Nausea Inducement): The shrill whistle released from his chambers is such a high pitch that having them swung close can actually damage a person's inner ear, causing a sensation of vertigo for three turns. The target's mobility is lowered for the duration.
Rock Hard Chambers (Durability): The chambers are extremely strong and solid, being as hard as stone.
Soundwave (Damage): A blast of sound out upon hitting something with his chamber, sending destructive sound vibrations into whatever the chambers are hitting.

Exhaustion and Weakness: Due to the fact his quirk is connected to his lungs, Yuri loses stamina very quickly in fights and easily becomes out of breath, making him unsuited for prolonged battles, especially when being forced to use most of his air in one attack. He also has trouble with ranges, his maximum range being short distance and thus needing to get close to be able to fight people.

Echo Chamber
Rank: E
Description: Around Yuri's forearms are two round, bonelike chambers filled with holes. Air enters these chambers through two ways, one is simply by air coming in through the holes, and the other due to his lungs having tubes that go through his arm and into these chambers and releases air when he moves his arms. His bone chambers also act as natural conductors for sound, amplifying the air and creating vibrations which turns the air released into airwaves, and also allows him to naturally create short range soundwaves. These airwaves can vary in frequency and decibel depending on how hard he swings his arms, able to create frequencies ranging from an extremely shrill high decibel whistle that can actually affect someone's hearing to the point of damaging their inner ear, to short range blasts if he swings his arms hard enough.

Benefits

Vertigo (Nausea Inducement): The shrill whistle released from his chambers is such a high pitch that having them swung close can actually damage a person's inner ear, causing a sensation of vertigo for three turns. The target's mobility is lowered for the duration.
Rock Hard Chambers (Durability): The chambers are extremely strong and solid, being as hard as stone.
Soundwave (Damage): A blast of sound is released upon hitting an object with his chamber, which causes the object being hit to vibrate at the same frequency as the blast of sound released. These sound waves are so intense and high in frequency that it can cause even concrete to shatter from the vibrations.

Exhaustion and Weakness: Due to the fact his quirk is connected to his lungs, Yuri loses stamina very quickly in fights and easily becomes out of breath, making him unsuited for prolonged battles, especially when being forced to use most of his air in one attack. He also has trouble with ranges, his maximum range being short distance and thus needing to get close to be able to fight people.

Blast
Rank: F
Effect:
Yuri actually swings his arms out as hard as he can, causing the air to actually shoot out from his chambers in a short ranged blast. This empties the majority of air in his lungs though, causing a similar effect to having the air knocked out of him after doing it.

Airwave Assault
Rank: F
Effect: Yuri actually swings his arms out as hard as he can, releasing a short ranged airwave blast that can reach around 7 meters. These airwaves are very high frequency, thus the strong blast of air combined with these sound waves are enough to break apart wood.

However, doing this empties the majority of air in his lungs, causing a similar effect to having the air knocked out of him after doing it. He also is very limited in his range given he can only create so much air for these attacks.

Echo Chamber
Rank: E
Description: Around Yuri's forearms are two round, bonelike chambers filled with holes. Air enters these chambers through two ways, one is simply by air coming in through the holes, and the other due to his lungs having tubes that go through his arm and into these chambers and releases air when he moves his arms. His bone chambers also act as natural conductors for sound, amplifying the air and creating vibrations which turns the air released into airwaves, and also allows him to naturally create short range soundwaves. These airwaves can vary in frequency and decibel depending on how hard he swings his arms, able to create frequencies ranging from an extremely shrill high decibel whistle that can actually affect someone's hearing to the point of damaging their inner ear, to short range blasts if he swings his arms hard enough.

Benefits
-Vertigo (Nausea Inducement): The shrill whistle released from his chambers is such a high pitch that having them swung close can actually damage a person's inner ear, causing a sensation of vertigo for three turns. The target's mobility is lowered for the duration.

-Rock Hard Chambers (Durability): The chambers are extremely strong and solid, being as hard as stone.

-Soundwave (Damage): A blast of sound is released upon hitting an object with his chamber, which causes the object being hit to vibrate at the same frequency as the blast of sound released. These sound waves are so intense and high in frequency that it can cause even concrete to shatter from the vibrations.

Exhaustion and Weakness: Due to the fact his quirk is connected to his lungs, Yuri loses stamina very quickly in fights and easily becomes out of breath, making him unsuited for prolonged battles, especially when being forced to use most of his air in one attack. He also has trouble with ranges, his maximum range being short distance and thus needing to get close to be able to fight people.

Echo Chambers
Rank: E
Description: Around Yuri's forearms are two round, bonelike chambers filled with holes. Air enters these chambers through two ways, one is simply by air coming in through the holes, and the other due to his lungs having tubes that go through his arm and into these chambers and releases air when he moves his arms. His bone chambers also act as natural conductors for sound, amplifying the air and creating vibrations which turns the air released into airwaves, and also allows him to naturally create short range soundwaves.

These airwaves can vary in frequency and decibel depending on how hard he swings his arms, able to create frequencies ranging from an extremely shrill high decibel whistle that can actually affect someone's hearing to the point of damaging their inner ear, to short range blasts if he swings his arms hard enough.

Benefits
-Vertigo (Cripple): The shrill whistle released from his chambers is such a high pitch that having them swung close can actually damage a person's inner ear, causing a severe sensation of vertigo and nausea that reduces a person's mobility by two for three turns.

-Rock Hard Chambers (Durability): The chambers are extremely strong and solid, being as hard as stone.

-Soundwave (Damage): A blast of sound is released upon hitting an object with his chamber, which causes the object being hit to vibrate at the same frequency as the blast of sound released. These sound waves are so intense and high in frequency that it can cause even concrete to shatter from the vibrations.

Exhaustion and Weakness: Due to the fact his quirk is connected to his lungs, Yuri loses stamina very quickly in fights and easily becomes out of breath, making him unsuited for prolonged battles, especially when being forced to use most of his air in one attack. He also has trouble with ranges, his maximum range being short distance and thus needing to get close to be able to fight people.

Airwave Assault
Rank: F
Effect: Yuri actually swings his arms out as hard as he can, releasing a short ranged airwave blast that can reach around 7 meters. These airwaves are very high frequency, thus the strong blast of air combined with these sound waves are enough to break apart wood.

However, doing this empties the majority of air in his lungs, causing a similar effect to having the air knocked out of him after doing it. He also is very limited in his range given he can only create so much air for these attacks.

Airwave Assault (Range)
Rank: F
Effect: Normally, Yuri's range is rather short. While he doesn't need a direct hit for him to damage people with his sound, he does need to be at least within arms length in most cases. However, if he swings his arms with all his strength, he's actually capable of sending out ranged high frequency air blasts, managing to reach around five meters.

However, his access to this range comes at a cost, using the majority of air in his lungs, and staggering him as he needs to catch his breath. This is also nearing his max range, due to physical limitations of his body and quirk. (He's got a max range of let's go with E due to weakness. LOL CQC Scrub).

Helpless (Silence)
Rank: F
Effect: Yuri smashes one of his sound chambers into the jaw of his target. This causes not only damage to the jaw from his attack, but also causes a high pitched ringing in the victims ears from his chambers amplified whistle damaging the targets ear drum. This makes the ability to speak and hear coherently marginally harder for three turns until the pain and ringing stops.

Helpless (Weakness)
Rank: F
Effect: Damaging the inner ear comes with a variety of issues, as does the host of issues that's sure to follow. Thanks to the mixture of nausea, vertigo, and just generaal unpleasantness all around, moving is a chore let alone actually trying to hit something all out. Thus when Yuri manages to damage someone's inner ear, they get a minus one to strength for three turns.

None

Boy of Many Cloths
Rank: F
Effect: Yuri's obsession with cute clothing whether male or female has actually made him by proxy a somewhat decent disguise artist, able to slip into crowds or hide his identity from afar. Of course, he's not actually practiced in such works, only being good at it due to his unique style choices thus even a good look up close from a slight graze is enough to give his cover. While he has a variety of choices, his favorite disguise seems to simply be his black coat with the hood pulled up while painfully hiding his bow underneath.