system
Given the following post, respond as if you're commenting on Reddit:
human
[The Good Place] Why was Chidi speaking with an American accent?

This is all based on the ending of Season 2, and shouldn't actually have any spoilered content for Season 3. But if you aren't through Season 2, you've been warned.

So, when we first met Chidi, we learn that he is most comfortable speaking French but Eleanor simply hears him in "unaccented" American English. A perk of the afterlife, it seems. Presumably, he continued to speak French throughout the duration of their time in the afterlife and afterlife shenanigans continued to translate for Eleanor/the audience.

Then, the push happens and the characters go back to Earth. At this point, when Chidi and Eleanor meet again, Chidi is teaching at a university in Australia. So, fair enough, he would most likely be talking primarily in English. But he's still a Senegalese expat, living in Australia, who (as far as we know) never even been to the US. He certainly shouldn't have an American accent, yet he does. How did that happen?
gpt
I believe, in the afterlife, he was speaking french, and Eleanor hears him in English, as you have said. Later, we learn he was educated in America, and so we can infer (from his accent and language) he is fluently bilingual, and simply prefers speaking French given the choice.