Where is it revealed that Mimmi is a Canadian mermaid? Yes the actress playing her is Canadian, but that alone does not mean she is playing a character from Canada.
From the trailer it seems that she is from the same Mako Pod that 3 previous mermaids were from.
Reviving an old one after finding that image of Canadian mermaid. That's not Mimmi, that Canadian mermaid is blond. And that tenplay link doesn't say that she Canadian too, only that she northern mermaid, played by Canadian actress.