Welcome aboard, Molly!
The awesome Disney Wonder will be such a great playground for you and your family this month. You must be pretty ready for the warmer weather now, since the cold weather in your neck of the woods has been hanging around too long. How exciting that you're already on your final countdown - Yay!
My family and I were just on the Wonder a few months ago, and enjoyed the various character meet and greets onboard. The
characters greetings onboard are subject to change, and it is difficult to say who will be there for sure on each sailing. Queen Elsa and Princess Anna's meet and greet has been a ticketed activity - so make sure you stop by the Guest Services desk to pick up a ticket for your family. The tickets are great, since you just show up at the designated date and time of your character greeting, and you wait for only a few minutes for your turn. When we showed up for our meet and greet, we were in line for less than 5 minutes - you won't have to worry about the kids getting anxious and impatient while in line. There is also a ticketed meet & greet for the Disney Princesses. When we sailed -- Snow White, Cinderella, Rapunzel, Tiana and Aurora were waiting for us so patiently. We loved having all our pictures taken and chatting with the Princesses... they are just so adorable with the kids.
The Disney Magic has the Marvel's Avengers Academy, but it hasn't quite made it to the Disney Wonder yet. We're hoping that it does soon of course.
Your kids will be absolutely smashing with their costumes I'm sure -- sounds like you'll be taking loads of pictures. There are so many magical moments waiting to be made... have a most magical cruise, Molly!
Happy planning,
~ Dolly