Legion No. X is a masked thief best known for his obsession with beauty and his distinctive white cape—he's almost always carrying a rose. Operating out of Semuria under the alias "Phantom Thief B," he became notorious enough to catch serious attention.
His thing is chasing beautiful moments and beautiful people. He was genuinely drawn to Kroze, seeing her as charming, though Estelle isn't a fan and calls him "The Pervert Mask" for his. let's say *inappropriate* fixations. He got involved in Weissman's scheme to steal "Hope" partly because he found something aesthetically compelling about watching people's faces when they resist and desperately cling to their hopes.
When he shows up in Crossbell during Zero no Kiseki, he's involved in a side quest where he steals a statue and stashes it in the mayor's bedroom—classic troublemaker energy.
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