She is a young woman who has big dark eyes and pointy teeth. Her most distinguishable feature are her long flaming hair with 2 bangs on each side and a wider bang going from the centre of her forehead to the right.
Burnin wears a light colored jacket. Her collar, belt and wrist guards are dark with a smaller white line. She wears a belt with a temperature gauge on the front and a fire extinguisher on the back, and has dark colored knee high socks. Her mask is black, similar to that of Katsuki Bakugo, and is connected to a headband.
As her Hero name would suggest, Burnin possesses a burning hot personality. She is very enthusiastic and her fiery personality tends to clash with Katsuki's.
As soon as Izuku Midoriya, Shoto Todoroki and Katsuki Bakugo enter the headquarters of Endeavor Hero Agency, after their battle in the streets against Starservant, Burnin and the other sidekicks of Endeavor's give them a hot welcome. She starts talking about the amount of work the old sidekick face and tells the students that they are going to work very soon. In particular she first clashes with Katsuki, right after Izuku recognized her, and then tells Shoto not to make himself comfortable just because he is Endeavor’s son.
Unnamed Quirk: As a Pro Hero, Burnin possesses an unnamed Quirk. It might be responsible for her hair having a flame-like appearance.