Brachiocrus is the name of the most common archetype of Endbeing forms.
Physical features
Brachiocri are the most humanoid out of the forms, the rest being weird arrangements of eyes, wings, rings, and other parts.
They have a varying number of arms, legs, and eyes, which can be arranged in many ways, such as the vertices of a symmetrical polytope. Sometimes the legs will instead be a serpent-like tail. However, it's extremely rare for a Brachiocrus to have only one leg or arm, though this can happen sometimes with the eyes. Usually Brachiocrus have bilateral symmetry, but they can sometimes have trilateral, quadrilateral, quintilateral, or even further symmetries.
Brachiocrus also can have varying mutations such as Triton-style ears or asymmetrically forked mouths (shaped like a sideways Y) [this is not even close to an exhaustive list].
Facial structure usually varies between draconic and humanlike, but can sometimes take on other forms such as wolflike or catlike, or occasionally even have something close to an LED display made out of natural cells.
Gallery

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A Brachiocrus with draconic facial structure and a secondary pupil mutation

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Two Brachiocri, both with serpent tails. (Left) Draconic facial structure with a plume of hair. (Right) Humanlike facial structure with the mouth forked in a sideways Y shape, and Triton-style ears