The Nikon line has wonderful options for available light.
Consider the fabulous Nikon 105/1.8 for tight, flattering, short-tele shots, with a comfortable, nonintrusive standoff from the subject(s). If you want wider/environmental, consider the 50/1.2. I like the dreamy out of focus elements and softer contrast, and the normal field of view works well for shots including just enough environment to frame the subject while not becoming a distraction.
I understand the favourable opinions on the 85s... for me that field of view is usually neither wide nor tight enough to catch my eye, but that's all very individual of course. It might work perfectly for you and your subject(s).
Anyone with a lot of, uh, character on their faces, you probably don't want to go with any of the superduper high contrast modern lenses. There's no hard rule, of course, and you should do what you want... and it's almost impossible for us to give good advice without knowing the character of your subject. You have to decide how best to bring that out... and maybe you need a holga, whatever!