Wow, you're getting so close!!! We just got back from WDW almost 2 weeks ago so I have a couple of pieces of advice for you. I also wanted to send you loads on

that Kenyan is going better and stays helathy for your trip.
Wall-E! - You won't find a moving Wall-E, but there is one you can take a picture with complete with a backdrop from the movie. It is located in the Animation Building in Disney Hollywood Studios. You can skip the building tour part and go straight to Wall-E if you enter through the gift shop. Go to the back of the shop, through the automatic doors (usually already open), through the little hallway type things and into the big room. He's right in the middle of the room.
Prince Charming - Are you going to a Halloween party? If so, make a beeline for Toontown and the Judge's Tent (between Minnie and Mickey's house). Cinderella and Aurora are there and during the party Prince Charming and Prince Philip join them. If you are not going to the party, can you get a reservation for dinner at 1900 Park Fare? Cinderella, Prince Charming, Lady Tremaine and the stepsisters are all there.
Characters meals - The character meals have an "entertainment fee" option when someone can not eat, but they charge $5 for the character entertainment. However, I would guess that they wouldn't charge you for Kenyan due to the nature of her reason for not eating combined with a Wish trip.
Ariel - I know that they are working on something special, but you could take the kids to Ariel's Grotto to meet her on your MK day as well. I'd bet Ariel would love to sing with Kenyan if you mentioned it on your visit.
I LOVE LOVE LOVE GKTW. You are going to have so much fun there alone. We got the honor of having a tour of GKTW a few years ago and it was wonderful. Even though we were just touring, they invited my DD to make a Wish pillow and have ice cream at the parlor. I can't wait to hear all about your wonderful trip and all of the magic that comes your princesses' and prince's way.