As tattoos are highly personal creations, it is difficult to give a definitive answer. However, there are a number of commonly used fonts including Old English, Mardian Pro and Fearless Script.
When searching for the perfect font, it is best to determine a couple of things before hand. What tone is the art meant to convey? What message does the tattoo send to those viewing it?
A number of excellent tools exist online to help someone determine what that perfect font will look like. TattooDesign.com provides an excellent tool called "Tattoo Lettering Designer" for those individuals looking for that perfect look. This tool allows people to use a plethora of fonts and shows them how their text will look in each font.