Why not just have the NPCs react to the MCs name? Example, if the MCs name is Gabriel (or similar) you could have a longer interrogation scene with the FBI, and have Gabriel and Michael make a couple of comments about the similar names too. Something along those lines.
So, My Lord, is there a reason why you don’t like being called Senpai? And if you and Ben need help coming up with gruesome death scenes, I could probably help