Ganesha - the Remover of Obstacles, the head of the Ganas, the attendants of Lord Shiva and Parvati Devi. He prevented Ravana from becoming all powerful by forcing him to put down a shivaling he was supposed to carry all the way to Lanka. He also made Kumbhakarna (Ravana's brother) misspeak the name of a boon, resulting in him sleeping for 6 months of the year.
Lord Ganesha My favorite God the first that you pray to for enlightenment,the God of overcoming obstacles and patron saint of the arts. Whether you believe in this sort of thing or not the legend is compelling.