Quirking characters could help the reader remember. It makes the character stand out of the crowd. But in my experience the reader even has trouble with main characters in longer pieces.

What about a situation of "Alicia, Bianca and Carla walked into a room..."? The reader should (by now) know all of them, and he does. But who is who? He has probably forgotten. Is there something I could do about it or do I just need to repeat each persons position or relation to others as unobstrusively as possible when they reappear at the beginning of a new chapter?

Satan_Klaus