Maybe you can buy one or two outfits for the Pleo and wrap them up as presents as well so your kids will be able to dress up the RB once they've met it. I'm sure they'll be very surprised! Do your children like dinosaurs? I remember I loved them when I was younger.
Just don't be surprised if you end up loving the Pleo even more than your kids do though. Aha, I know a lot of people plan on buying Pleos for their kids or family members and then end up keeping them for themselves. It must be really exciting for you to finally get a Pleo, I know I always love researching new robots that I buy and watch tons of videos of them online until my own arrives.
The Genibo will be my main Christmas present, but I have a few other smaller things. The one I bought was used and defective, so I got it for near the price of a new RB. I have a blue Genibo SD already and I'm getting a pink QD to be his sister. I want to at least open the new Genibo by the 20th since I have a Christmas party then that I always bring my robots to and the kids there absolutely love my current Genibo, so I know they'll be excited to meet his sister.