I'm really interested in mangas about two ppl who speak different languages. It can be romance, supernatural, or any genre, really. I'm pretty open.

I would prefer it to be that these two people can have either zero or little understanding in each other's languages or culture, and at the beginning try to communicate but struggle to with misunderstandings.

I don't want it to be like a japanese person idolizing french culture and speaks perfect french like a native, stuff like that haha.

Thanks!

Ichiro Heian! fits pretty well with what you're looking for.

Aside from that, you could try the language barrier tag.

I think China Girl fits pretty well. It's quite short but it's pretty good.

Kanata Kara has that at the beginning, when the main protagonist struggles to learn the country's language.

Pochi Kuro also has two protagonists who can't understand one another.