Urchins
From The Fifth City Wiki
"A suspicious number of orphans call the tangled streets of the Fifth City home. The child-gangs that plague us include: the Fisher-Kings, the Naughts, the Crosses, the Regiment, and the Knotted Sock."

Urchins: the probably futureless street-roaming orphans of London. They have territory throughout London, but they're particularly noticeable around Spite and in the Flit. There are several infamous gangs, listed in the sidebar snippet above; each has its own peculiar customs and traditions. For example, the Naughts and Crosses seem to be playing a giant game of, well, naughts and crosses (aka tic-tac-toe), and the Fisher Kings actually fish for head adornments!
Who Works with the Urchins?
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Tricksters
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Conjurers
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Crooked-Crosses
What do the Urchins Deal In?
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Maniac's Prayer
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Correspondence Plaque
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Aeolian Scream
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Storm-Threnody
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Rookery Password (a mark of recognition)