Are Crona and Maka canon?

Excuse me, could you please clarify for me whether Crona and Maka are considered canon in the context you're referring to? I understand that these characters are part of a popular series, but I'm unsure about their official status as canon. Could you elaborate on what the criteria for canon status might be in this case, and whether or not Crona and Maka meet those criteria? Your insights would be greatly appreciated.