Sputter

is the name of the sentient fireball that Maki Oze creates using her abilities as a Second Generation.

Usage
Pusu Pusu takes the form of a small floating fire-blob that generates the sound of crackling fire. Though the technique isn't lethal, it can knock down and subdue an individual. It can also be used defensively, by utilising the flames of an enemy to become this. With enough flames, the technique can generate a gigantic, horrendous-looking fireball.

Trivia

 * The creature's appearance has a similar appearance to the soul of Maka Albarn, a main character from Atsushi Ōkubo's previous work, Soul Eater. The creature also shares its voice actress with Maka.
 * Pusu Pusu ("プスプス") is onomatopoeia of crackling fire.
 * The huge fireball creature, produced using Pusu Pusu and Third Generation flames, can somehow bleed, despite being made out of fire. This is most likely for comedic effect.
 * In the subtitles, as well as English dub, Pusu Pusu’s name is changed to Sputter.