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, whom Dirk has never beaten. His name comes from a kind of waveform. The mouths of both Sawtooth and Squarewave are reminiscent of the shapes of their namesake waves.
He is shown to use red text with near perfect syntax, using outdated slang and all caps. He is also predictably susceptible to liquids, dashing the hopes of fans longing for a Squarewave BLUH moment.
When the Red Miles attack Earth and kill Roxy, Dirk flies to her house and brings Squarewave with him. After kissing Roxy's corpse, Dirk commits suicide via sendificator to ensure his own dream self's revival, leaving Sawtooth in charge of starting the entry process so Roxy's house will arrive in the Medium.
- Squarewave seems to be in favor of Dirk and Roxy being in a relationship, because he has been known to exclaim “YEAH DOGG!!!” both times they kissed. However, he might also just be programmed to do this any time anyone is sucking face in his presence.