User blog comment:Zathronas/Speculative author: Volume 2 and episode 12, general thoughts/@comment-70.209.104.70-20141101174000/@comment-10380701-20141101180623

Well. By this point, there's really no one else to introduce, except Scarlet, Sage, Qrow, Taiyang and... Raven.

At the moment, the cast of RWBY is good enough for several Volumes, so I don't really expect anymore new characters that will be important to the plot.

Watch Volume 3 introduce an entire squad of characters.