You may have been looking for Triangle People.
Shape People are a species found in the video game The Raccoon Who Lost Their Shape.
Shape People are flat shapes with faces. They can't move on their own because they have no arms or legs and must move around via the Shape People Tube System. When Shape People die, they go to the realm of the dead, from where they can be summoned by summoners, as long as a personal item of theirs is present. The Summoner states that shape ghosts smell of sweaty crocodiles.
Not much is known about shape people society, except that shapes with more sides are often seen as superior. It is also common for richer shapes to be turned into "Shape Wine", in a similar way many humans chose to be cremated.