Prince Sonic the hedgehog: He is the king and queen's son and the princess's young brother.

Princess/Queen Vampirina: She is Sonic's older sister and the next queen of Arendelle; she has snow powers

Owlette: She's a ice seller who helps Sonic find Vampirina and return the summer to his kingdom

Spirit: He's Owlette's horse and best companion since she was little

Demi: He's Sonic and Vampirina's snow ghost since they were kids and he loves summer things, and he don't knows anything what happens with the snow in the sun

King Jack Frost and Queen Rosalina: They're Sonic and Vampirina parents and they take care of them in case there was something wrong with their children or their kingdom

Princess Adagio: She's the princess of the Southern Islands and Sonic's lover (he doesn't know if she is his true love)

Duquess Trixie Lulamoon: She calls Vampirina "monster" when she discovers her powers and does anything to get rid of her