It turns out sharing the same name has a wonky effect on the efu quest system. You are counted as one person for the purposes of party size, and having a DM manually add me to the quest still does not let me enter the quest by normal means- as the 'other Darkman' is already within. The only fix I can think of would be to have a DM teleport me into the area and then go on from there.
This is such a low-level issue for such a unique situation that I doubt there's an easy fix for it, but I figured I would report it all the same.
For future dark-themed namers, you probably could have had one person put darkman as the first name, and one as the last and that might have fixed it?
I wonder if hitting the spacebar a couple times for the last name would make a difference.
Adding a few spaces before and after your names would definitely differentiate you in the system. I think.