I agree with BlindPassenger. The "other canon" section isn't exactly bursting with new fics and there isn't much discussion or fics based on Supergirl or the new show (yet, at least). Only time will tell if the new CW show will gather a following (and last as a show), and if it will trickle into this message board, but for now, I don't see the need to make a separate space for them.
