Haruki Sako

Haruki Sako (栄生 •張る気 Sako Haruki), also known as Festival, is a student in class 1-A at U.A. High School, where he is training to become a Pro Hero.

Physical Appearance
A fit young man of a very muscular build with, often messy, curly dark brown hair. Numerous scars adorn his arms and upper body, the ones on his knuckles seemingly being scrape marks of some kind. He has a small scar on his left cheekbone and dark brown eyes. He often sports a smile, even during the bleakest of situations.

Casual Attire
A old olive-green bomber jacket over a tank top, ripped jeans and simple boots. He also often wears worn black fingerless gloves if it's cold outside.

Costume Description
A white crop top, red cape and a pair of black shorts, as well as a pair of red gloves, and some red boots. He created his costume himself.

Personality
Upbeat, confident and loyal to his friends, he does his best to make everyone around him happy and safe. He always seems to be in a good mood, and does not give up easily when he wants something. But most of all, he is determined to become a good hero. He tries his best to give everyone around him confidence and courage by acting happy and smiling even when the odds are stacked against him. Despite all of this, however, he’s not the sharpest tool in the shed, often throwing himself into dangerous situations. It is unclear if this is because he just isn’t scared of pain or dying or if he’s just too stupid to see the danger in the situations he puts himself in.

Quirk
Quirks are the name given to the superpowers of My Hero Academia. Over 80% of the World's population has one and if this character is intended to be at U.A., they are no exception.

Quirk Name: Muscle Balloon
Haruki is able to inflate his muscles with air, giving them a level of bounciness depending on how much he inflates them.

Detailed Description:
When the Haruki inhales, he can fill up his muscles with air. The muscles then inflate like balloons, growing in size. While inflated, his muscles become much lighter and bouncier than when not inflated. The increase in bounciness depends on how much air the muscle contains, and the weight as well. When muscles are fully inflated, they gain a significant increase in bounciness and decrease in weight, and not fully inflated muscles don't gain any big increases in bounciness. So far, his muscles can increase to a maximum of double their original size, gaining enough bounciness for him to bounce like a human bouncy ball and becoming half of their original weight.

To deflate his muscles, he exhales the air. He is able to take in much larger amounts of air than normal people, and because of this enhanced breathing the force at which the air is exhaled can be enough to send him flying if he's not careful.

He can't breathe while holding himself inflated. Because of this, breathing exercises and proper breathing is crucial for effective use of the quirk.

His skin is naturally able to stretch more than a normal persons because of their quirk. Also, he is able to inflate himself enough to float slightly and become bouncier, but not rise in height. In order to do that he has to jump into the air while inflated, which will make him fly higher into the air than normal as long as he stays inflated.

Because of the nature of the quirk, he has to be careful not to pull a muscle by overinflating. Doing so will put a significant strain on the muscles, which can cause serious damage. Because of how exhausting it is to inflate, a general rule of thumb is that he can inflate a maximum of 2 body parts to maximum capacity at any one time.