What would someone who is 25 percent black and 75 percent white look like?

They'd probably look like a white person. I know someone who is 25% black and I never knew until they told me. The actor Van Disel is also 25% black and you can't tell at all! Mostly its very rare for them to have black features because there's more white in them than black. They might have a slightly darker skintone than white people, but I think that would be the only black trait that would be noticeable.