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Naturally charming, as well as being sly and manipulative, Xizzii possessed many of the traits that his species had become infamous for. Discovering a natural ability to manipulate others through the Force, he began to use it in conjunction with his pheromones to manipulate others to fulfill his own ends. He kept himself moving, always looking out for a new mark and trying to stay a step ahead of the authorities. Over the course of several years, he was able to accumulate a reasonable degree of wealth.
In 36 ABY, he learned of Forjj Blackblade, a Dark Jedi who was holding a contest to find his next apprentice. Intrigued, he entered the contest planning to manipulate the other contestants against each other. He didn't realize, however, that it would be a battle, putting him well out of his depth.
Confronted by Hizzarg Krellish, the Falleen decided to use his pheromones and abilities against the rampaging alien. Unfortunately, for some reason, his abilities didn't work as planned; Hizzarg became convinced that Xizzii was a female and desired to mate with him. Realizing that he had made a critical error, the Falleen tried to repel him, which only served to enrage the massive alien. In a fit of fury, he crushed his smaller rival with his massive fists.