Marichat

Marichat is the pairing between Marinette Dupain-Cheng and Cat Noir. This can be considered as the opposite of Ladrien. Marichat is a very popular ship within the Miraculous Fandom, though, as of now, it seems to be the most unlikely cannon pairing (in the love square.)

In-canon, both Ladybug and Cat Noir are (not-so) blissfully unaware of their secret identities, thinking that it would keep them from becoming too attached to one another.

Cat Noir has encountered Marinette outside of her secret identity more than once, such as in "Evillustrator" when Ladybug asks her to look after her secret identity, since the villain of the episode Evillustrator has his attention on her and the balcony scene in Glaciator.

Because they do not know each other's secret identities, this removes those barriers when Marinette (as Marinette) talks to Cat Noir (as Cat Noir). allowing her to talk almost openly with Cat as opposed to her usual nervous demeanor around Adrien although she can't do something that she does as Ladybug (like calling him Kitty) so she wouldn't reveal her self. This could even cause her to admit her feelings for Adrien to him, allowing her to essentially confess her feelings to him without even knowing it, but they can be pretty awkward with each other (example Weredad)

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Cat Noir is able to speak to Marinette in his usual manner without the need to keep his image, and would even be able to confess his more sincere feelings to Ladybug without even knowing it.