Gemini for me! Knocks stuff over, scrapes nails against walls, smashes glass - I confess that it would probably be something I would do Not to be entirely malicious, just something active and hopefully somewhat playfully entertaining without being too dangerous. Although the Cancer one sounds lovely! Wouldn't be adversed to the idea of being a guardian angel to a well deserved loved one!
*I purposely blurred out the original word to respect our guidelines. We shall replace the original "S" word with the more appropriate "Stuff"