Squarewave

Squarewave is one of two rap-battling robots built by Dirk Strider. His appearance is based on one of the robots in the C.R.U.N.K. poster on the wall of Dave's Room. He is an enthusiastic rapper, but Dirk can easily beat him in a rap battle, unlike his counterpart Sawtooth, who Dirk has never beat. His name comes from a kind of waveform.

He is shown to use red text with near perfect syntax, using outdated slang and all caps.