Wu and Garmadon: Japanese
Maya: Chinese
Ray: Filipino
Elena: Scottish/Irish with a bit of American
Ian: Puerto Rican
Valentina: Italian
Cyril: Danish
Seraphina and Malcom: American
Karen: British-Canadian
Noah and Francis: French
Aurem: Greek
Aslan: Turkish
Neil: Persian
Gabriel: Irish-French
Liam: American
Evanora: Chinese
Morro: American-Chinese (leans towards Chinese really)
Krux and Acronix: Unknown,likely has some Japanese blood though
Ivy: Australian