From Homestar Runner Wiki
Strong Sad is the most depressed
main character. It is unclear how he was born, as his
belly button was apparently created by
Strong Bad using a
drill that
he received for his birthday. He stands somewhere between
his brothers in height, and he has large, elephant-like feet he calls "
soolnds". In the past, poachers have apparently offered large sums of money to obtain Strong Sad's feet. His body is round and is two shades of grey — a lighter grey from the waist up, and darker grey from the waist down. His head is white and has an odd lump on the top (a trait shared by
Mr. Bland). He is usually very calm and soft-spoken, although he has become
hyperactive (at least once under the influence of
caffeine), and he has also temporarily (and involuntarily) become a
radio DJ once or twice. The words "Covered Bridges" seem to be able to put him in some type of trance, as seen in
Fall Float Parade.
(More...)