How tall the suspect was? Did the suspect walk with a limp? Did the suspect have a tattoo of a dog on their forearm? Was the suspect a male or a female?
All of these descriptions are vital regardless of how insignificant they may seem. Its always important to get at least an approximate height, weight, race, age, and sex of a suspect. However, unique characteristics on a suspect can be just as important if not more useful than the obvious. Things like tattoos and even scars are characteristics that are more likely to be permanent and difficult to conceal and/or change.