Generally speaking, the factors that make a white woman built for BBC are a fit, yet not overly muscular body. A relatively high body fat% leading to decent meat on those bones. This produces a soft, yet firm consistency that black men love-- where the ass ripples when given a smack. Usually thrower body will be very well developed and she will be flexible and somewhat athletic, often wearing sportswear or athleisure style clothing.

Generally she will have full lips, and a smooth even complexion. Finally she will have long straight hair, often kept in ponytails or braids. The makeup is usually subtle yet flirtatious, with glossy lips, and often hoop earrings or bangles. Large tits are not required, small to medium size boobs might fit her frame more. Tattoos should be subtle if present and cute and feminine not overly distracting, bold, or artistic.

Many white trans girls easily fall into the "built for BBC" body type and the relatively low maintenance fashion sense. They're also sexually adventurous and playful and predisposed to have anal sex. That's why they have a natural affinity for black men and vice versa.