Pixie came from a Monster Type of the same name that generally most human-looking in appearance. In spite of the name, Pixie's monster type is around human-sized and their appearance more like succubus due to having two curved horns, leathery bat-like wings, and a long whipl-ike tail. Her closest servant and partner is Big Blue.
Pixie is the first of the Big Bad Four to fight the Searchers. She enslaved the inhabitants of a village, with her followers and underlings the Clays bossing them around. For his failure to defeat the Snatchers, Pixie killed Captain Clay, and then fought the Searchers. They eventually gained the advantage over her, and she took out one of the pillars of the ruins with a Torpedo. Genki and Big Blue saved her from the falling rubble, and she left with Big Blue. From here, she officially turned good and helped the Searchers out several times. She was with them when they attacked Naga's castle.
Pixie was mortally wounded by Moo, so Big Blue fused with her to turn her into Granity and save her life, though it meant sacrificing his own existence. She later watched the final battle between Moo and the Phoenix as they destroyed each other.
In season 3, she returned once again, but the reunion with Searchers was tense due to Granity was mind-controlled by one of Durahan's minions. Fortunately, with Genki's help and Big Blue inside her, she got better.
Pixie uses Flame Wall, a wall of fire to defend against attacks. She also uses Torpedo, a ball of lightning, and zaps enemies with bolts of electricity called Lightning.