| rdfs:comment | - Operetta was trademarked on October 23, 2007, which was eventually abandoned and the name re-trademarked on November 17, 2011. Her first doll came out in Mid January, 2012. As of January 01, 2015, her doll number totals 13 and makes up 3.82 % of the entire Monster High doll collection. Few other merchandise of her is available.
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| abstract | - Operetta was trademarked on October 23, 2007, which was eventually abandoned and the name re-trademarked on November 17, 2011. Her first doll came out in Mid January, 2012. As of January 01, 2015, her doll number totals 13 and makes up 3.82 % of the entire Monster High doll collection. Few other merchandise of her is available.
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