Thoughts on who will play Amy Rose?
I managed to make a lucky guess with Shadow in my previous post.
https://moviechat.org/tt18259086/Sonic-the-Hedgehog-3/62909b64d97d95678b1e55b6/Thoughts-on-wholl-play-Shadow-the-Hedgehog
I don't have one specific actress in mind this time, but they'll likely choose whoever's popular right now: Zendaya, Sidney Sweeney, Anya Taylor Joy, or Hailee Steinfeld. Since the other voice actors are much older, they could also choose an older actress, like Scarlet Johansson or Hayley Atwell, however I think they'll choose a younger actress to play off how young she is (even though all the Sonic characters are young).
So I think an older actress will be chosen for Rouge instead, if she shows up in the movie, in which case ScarJo or Atwell would work.