Mica is one of a number of trolls who appear in the City Watch novels as Troll Constables, never with much dialogue (he is a Troll, mind...) but who are there doing a solid job and upon whom Commander Sam Vimes can almost always rely.
Mica is also the name of the bridge troll in the short story Troll Bridge. Whether Mica moved from the cold Rimward bridge to Ankh-Morpork is unknown. It is, however, possible that the two merely share the same name.
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