Stolen Identity?

Finally I saw the new "The Loud House" episode "Pulp Friction"*, in which Lincoln, Clyde and the girls are dressed as superheroes.
Luan called herself "the Joker" and her outfit looks similar to Harley Quinn.
I thought by myself: "Would that be okay for them?" Here can you see the answer.

Translation:

Luan: "But it should be only a joke..."
On the paper: "Breach of Copyright"

* They should nominate this episode for an emmy this year