I'm not sure of the site guidelines for creating profiles of living individuals to whom you are not related. (I searched the index but could not find.)
I definitely would not go the "anonymous" route.
But I see potential problems even if you have names...Do you know their exact birth dates? You will need that or an approximation to create the profile. What if that still living person (or their close family member) wants to join WikiTree? They could create a profile for themselves (or their close family member) without knowing there is a profile for them already on WikiTree, especially if you are only using an approximation of their birth date. So, there is a huge potential for duplicate creation. You'll also need at least one source for their profile to be in compliance with WikiTree standards.
Personally, I wouldn't do it. If you are related to them and/or have their permission, that would be totally different. Others may have different thoughts...these are solely my own.