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 first 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)