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Canon Welding: He's managed to tie in almost all of his own personal property without even resorting to parallel dimensions (though those do exist in his works).
Catch Phrase: In all three of his urban fantasy series, he uses variations on "Needs must, when the devil drives" and "Suddenly and messily." And when we say variations on the first one, we mean he's gotten pretty damn creative. Also, he loves to have his characters to use their over-the-top reputations to intimidate their foes.