"Hexagon Speaker Box sounds like a boy, even though she's a girl, and that's just... WRONG!" - Pen
This character's gender hasn't been revealed by the creator. When editing, use singular they pronouns when referring to the character. If the gender has been revealed, please provide a source when adding it.
Hexagon Speaker Box is an almost silent speaker box that debuted in "Hurtful!". The line they had was for saying "We are also clones!" along with the Triangle Speaker Box, but their voice overlaps with Triangle Speaker Box, causing difficulty in hearing it.