Percy Shelley , Mary's husband, served as a major influence for the character. Victor was a pen name of Percy Shelley's, as in the collection of poetry he wrote with his sister Elizabeth, Original Poetry by Victor and Cazire .  There is speculation that Percy was one of Mary Shelley's models for Victor Frankenstein; while a student at Eton College , he had "experimented with electricity and magnetism as well as with gunpowder and numerous chemical reactions", and his rooms at Oxford University were filled with scientific equipment.  Percy Shelley was the first-born son of a wealthy, politically connected country squire, and a descendant of Sir Bysshe Shelley , 1st Baronet of Castle Goring , and Richard Fitzalan, 10th Earl of Arundel .  As stated in the novel, Frankenstein's family is one of the most distinguished of the Genevese republic and his ancestors were counselors and syndics. Percy had a sister named Elizabeth; Frankenstein had an adopted sister, named Elizabeth. On 22 February 1815, Mary Shelley delivered a baby two months premature; the child died two weeks later. Soon after, Percy left with Claire, Mary's stepsister, with whom he was having an affair.  The question of Frankenstein's responsibility to the creature – in some ways like that of a parent to a child – is one of the main themes of the book.
The book doesn't specify if the monster was created by one man or several or how he was brought to life. I think we can safely guess that the monster was brought to life using electricity because it has such an influence on Victor. SPOILER ALERT. I would also say that is safe to say that the monster was probably created using more than one man because later on Victor tears apart/destroys the monster's companion before he completes her creation. These are just my thoughts and if anyone has anything else they would like to add please comment