If you see a character walking at a fairly decent pace, it’s okay to call out his or her name, and maybe put your hand out for a high five. This is not the time, though, for a picture and a hug. Most of the time the character is on the way to or from a set meet and greet location. You can get your picture and hug there. Make sure that any little ones in your party know this as well, so that they will not be disappointed.