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Along the way , they interact with the other main characters of the show : Princess Bubblegum ( voiced by Hynden Walch ) , the Ice King ( voiced by Tom Kenny ) , and Marceline the Vampire Queen ( voiced by Olivia Olson ) .
 person: Hynden Walch; person: Olivia Olson
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Hynden Walch; person: Olivia Olson