An addition to those previous ideas: how to deconstruct the Abuse streryotype. For example, the moment Sora (or Riku) finds out that the Sue is being beaten b her parents, he actually calls 911. Or, considereing these characters, they might take matters into their own hands. After the abuser is dealt with, the Sue is actually UPSET that her source of angst is gone, and that she has lost her chance to seduce the male lead via Hurt/Comfort.
Also, to poke fun at the constant FF cameos in these fics, the characters would constantly appear at random in Destiny Islands, via a space/time rift created by the sheer Suishness. Also, Sora and friends would always try to bring up their adventures with one another, only to be yelled at by the Sue for even talking about "un-sexy Disney characters." Eventually this becomes too annoying for them, and they simply begin ignoring her. The sue, snce she is an attention whore, is distraught at this, and would go to terrible lengths
to get her goals.