about m-me
Story
Professor Quirinus Quirrell was a wizard who attended Hogwarts School of Witchcraft and Wizardry and was Sorted into Slytherin House. He was the Muggle Studies professor at Hogwarts, though he later became the Defence Against the Dark Arts teacher during the 1991–1992 school year. While Quirrell travelled around the world, looking for first-hand experience before teaching D.A.D.A, he met Lord Voldemort, and then was spiralled into corruption. He shared his body with Voldemort and became loyal to him, helping him find the Philosopher's Stone, and eventually died while trying, in vain, to murder Harry Potter.
Personality
Not much of Quirrell's personality before he met Lord Voldemort in Albania is known; as he said, when he was a young man, he believed in good and evil, and was a good person. He was also said by Rubeus Hagrid to be a very intelligent and talented wizard, though he was usually stammering, possibly because he didn't have much confidence. However, when he met Lord Voldemort, Quirrell's personality changed; he "realised" that there was "no good and evil, there is only power, and those too weak to seek it." Quirrell wanted to serve Voldemort, but he admitted that at times it was hard to follow Voldemort's orders. By that time, Dumbledore has already surmised that Quirrell was full of hate, which led to his demise because the love Lily Potter left in her son's blood was fatal to him. In short, Quirrell was a gullible and weak willed wizard who was easily corrupted.
(taken from Harry Potter wiki)