I once had a deep gnome PC who was a thief/illusionist. He fled from drow slavers, and made his way to the surface. He always grumbled about the noise the fighters made, and was a little outrageous. He was anything but a tinker gnome. He cared about his party, but thought they were strange and a little foolhardy. (Going after an aboleth.. it worked, just barely.) He would occassional throw in a practical joke to teach someone a lesson. He was more than a little volatile, possibly due to his earlier life. Unfortunately, he died due to a failed saving throw.