I think this is one of the isekai characters who reveal that they are not from that world.

The other one I can recall off the top of my head is

spoiler for another series

Kazuma from Konosuba, pretty late in the novel.

It’s just so rare, and the fact that they came from another world is usually irrelevant to the plot, that the story could as well be a standard fantasy story.

So I like it when authors make the transmigration plot-relevant.