Why these characters matter
The anchors worth learning first are the ones with the fewest lookalikes. Bungo Stray Dogs has 5 characters, all listed for 2016, where white hair appears on only 1 of them, while black covers 1 — so a distinctive hair colour is often enough to locate the right cluster.
Learn Atsushi Nakajima first, then the candidate it is most often confused with: Chuya Nakahara and Doppo Kunikida agree on 4 of the five clue traits. That one comparison removes the most common failure in Bungo Stray Dogs mode.