Mister Meddle's Mischief by Enid Blyton
Mister Meddle is a pixie with a long nose, which he is forever poking into other people's business. Accepting his offers of help, the innocent characters are unaware of Meddle's meddling ways and fall victim to his troublesome actions. From pouring furniture cream on Sally Simple's strawberries, to losing Mrs Tilly's baby and Miss Tubby's dog, Mister Meddle creates many muddles: his good intentions never have a positive outcome.