I have to admit, I can't comment on the kiddies part, but I can on my own experiences, and they have all been stellar. These are ACTORS not just models, and thank goodness! (You can tell the difference!)
Maybe now that I have an AP, I might start doing more character lines, but I haven't yet. The only one I DO is the Visa Character photo, and there have been some cute ones there. We always pose with duel 'kisses' on Mickey and Pluto (or Goofy.) One time, us girls were taking a Minnie photo op and Pluto intentionally SUPER PHOTOBOMBED IT! I went back and downloaded it later. He stole the whole shot, so funny. He posed with his paws in front like a puppy for the kiss photos, so cute! Minnie and Mickey are ALWAYS class acts.
Thankfully, that's where the cruises ROCK! (a WHOLE lot less lines for photo ops!)
DCL Magic/Dream:
Belle -taught us how to pose like princesses. This is extremely useful and we use it A LOT.
Ariel- when we told her we were mermaids on
Castaway Cay (see name), without missing a beat, she asked us what color mermaids we were? Twinkie was a multi colored pink and aqua and I of course was green! (I've since added bright coral orange because the lifeguards made me where a horrible hot yellow life vest that totally clashed with my shells so I would be visible. The coral orange solved that problem the next year!)
Rapunzel- This one was special for me since I had hair past my hips. We took cute photos comparing and then she had me pinkie promise that I would continue to grow it out as long as it would grow! (If she only knew about my hideous pool hair moment this week that cost me 5 inches, who knows what she would say! *weeping* Its coming back though!)
Have also had some neat spontaneous ones. I always dress like a pirate for the cruise (but so does half the ship) so when a pirate came up to me and said "just wait here, we are going to take the ship!" and I said "are you a guest?" and he said "A guest of what? We are taking this vessel!" And I complemented him on his HUGE hat and he nodded (I had a large buccaneer hat myself) and then just like that, he swooped down on a rope and was in the show. They did indeed commandeer the DCL Dream! (Thankfully Sparrow came and took it back and of course started the fireworks...)