I like Tri-X, Classic/ClassicPan/Fortepan/Arista.EDU 400, and Efke 100 in ABC pyro for portraits. Here's one in the APUG gallery--
(there was a url link here which no longer exists)
Historically, of course, many portraits have been done in pyro of various flavors.
I like the tonality of ABC, but if you are shooting medium or small format, particularly with a condenser enlarger, you might prefer PMK, which has a better grain masking effect. I contact print or use a cold light head and tend not to make huge prints, so I feel comfortable with ABC down to 6x7, but I use PMK for 6x6 (and I shoot very little B&W smaller than that).