As announced today, City of Heroes now has visual sounds:

NCsoft NorCal is proud to announce a new feature for the City of Heroes® and City of Villains® games; that of Visual Sounds. Visual Sounds are based on the comic book staple of onomatopoeia, or the use of a word to replace a sound. Classic comic book examples are "Pow" and "Ka-Boom!" in colorful bubbles while heroes and villains are slugging it out. City of Heroes takes a huge stride forward by replacing simple sounds with the exciting new visual medium of Visual Sounds.

Check out the link above for more 'sounds'. *WHACK*