idk if I have forgotten about this, but Shironeki would definitely show up to be recruited by DA; he is motivated to do the good for the world. Shu would, as he is attached to Kaneki; he is also intrigued about Harry's activism. Chie goes along to join the fun.
Chie's patronus is a mouse. Shu's can be a dog. Dogs are loyal, and they don't bother mice much.
Other DA members are wary of Shu and Chie, while Harry steps (not completely) to their defense. Both wouldn't mind, but sometimes Shu finds it annoying.