Arc One: Sylver
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Sylver is the main character for the first arc, the three books: Thunder Oak, Castle Storm and Windjammer Run.
Gaslight Geezers, book one of the second arc.
Arc Two: Montegu Sylver
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The second arc is set six centuries after the humans reached Welkin. Montegu Sylver, the main character of the second arc, is the descendant of Sylver. The second arc consists of the books: Gaslight Geezers, Vampire Voles and Heastward Ho! 
Tunder Oak, book one of the first arc.