The biggest mystery presented in the first trailer is the appearance of two new characters. Though they were only in the trailer for a few seconds, they're already 10 times more intriguing than our favorite Arendellians because we have no clue who they are!
The characters in question are a girl and boy who appear in the forest. The girl is seen standing surrounded by red leaves as she looks to her side, where a blond-haired boy blasts out from underneath the leaves and spins in the air. There's no telling which one of the two created the gust, but it does allude to the fact that one of these characters possibly has elemental abilities like Elsa. There's also a stark difference in their appearance: the boy is dressed in clothing that's similar to Elsa's in the first movie, meaning he's probably well off. The girl is dressed in more simple clothing, similar to Kristoff's clothes.
One theory on their identities is that the two are the children of Anna and Kristoff, mostly because of the similarities between their hair colors. However, while Anna and Kristoff look different in Frozen 2, they don't look that much older. Definitely not old enough to have kids that are at least preteens.
