I agree with the opinions generally being shared, I'm not bothered by the removal of Zu herself, she was never a Sonic character or Sonic OC, so it never quite fit.
It's the removal of the sex animations that would be a shame. Zu had a few good ones, like the tentacle trap all-the-way-through anim for example, that were unique to her.
Are the Zu animations going to be re-added in some form or another? Like adding a new character to replace Zu and remaking the animations with them? Or possibly distributing the unique animations around to the existing characters?