Abyssal. The heartless entropy of the Abyss, the
howling chaos of Pandemonium, and the vast
despair of Carceri call to tieflings who have
the Abyssal fiendish legacy. Horns, fur, tusks,
black blood, and peculiar odors are common
physical features of such tieflings, most of
whom have the blood of demons coursing
through their veins.

Also, allow me to point out that, under Cthonic Legacy, we can have yugoloth ancestry, which means we could look like and Arcanaloth:

Looks like we've got Cthonic ancestry as our fiendish legacy.

Which of these yugoloths did we inherit physical features from? I'll reply with pictures so you can see what we're talking about #DnD #ttrpg