Mr. Boldova (Samuel Sparks) has the power to turn rocks into superheated sparks and sustain the heat which they produce. His brother is Ollie Sparks, once turned invisible by a blue snake. He used to be an art teacher in Bloor's, and often helped the children out of dangerous situations. At the end of the third book, Charlie Bone and the Blue Boa, he left Bloor's and went to live in Sparkling Castle with his family.

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