Ask the CM " minder" each Character has a minder with them, if you let that CM know, they will assist, but Mickey has four fingers and sometimes can't hold things.
My son 18 months had a Chip feed him a whole bottle of baby milk. It was busy and we were worried that other children wouldn't be able to see Chip. But Chip insisted, by communicating with the minder CM. Later we saw Chip in another place and Chip was able to gesture, that he remembered my son from earlier.
The Minder CM is there to take care of the characters and ensure thier OK, and have no issues such as health issues. They form their own communications between them.
Some characters it wouldn't be possible, Buzz for example being made of plastic has plastic hands, face characters such as princesses who can speak shouldn't have an issue.