Rocket mouth

User can breath fire and is resistant to heat in order to breath it however the more serious they breathe fire the lighter their body is so a small flame doesn’t do much but a proper fire breath attack puts them in a state of weightlessness which is a huge problem as they will be rocketed back in the opposite direction there breathing fire at.

This quirk requires the user to have outside help to remain stationary when breathing fire however with support gear they are able to fly properly as if having a jetpack by breathing fire into tubes connected to their mouth that extends onto their back.

Additionally having weighted clothing helps or items that become heavy when activated.

On its own the quirk can be used to avoid falls and traverse high areas with ease and also dodge attacks while also making the user really good at close combat if done right.

Roller blades would also make a great support item.