1) In writing Tenchi Muyo fanfiction, I think it is reasonable to assume that everyone in your audience has seen the episodes of the anime, but not that they are familiar with the manga. I'm a hardcore fan who has owned the manga in hard copy since they started selling it in the US and even I didn't remember the wolf and Hiwa story arcs. If you are going to bring things like this up, even in passing, then some more detail is needed.
2) I don't get the concern over the counterpart. I suspect that most people on the planet have a close look-alike somewhere. Once you allow for age differences so that someone looks like an older or younger version of someone else, then the "twin" sets probably grow to include almost everyone.
Edit: For that matter, I don't get what you are trying to prevent with this makeover. Are you woried about people in Earth governments or inteligence agencies paying attention to the Masaki Household? Juraian nobilito or other extra-terestrials come looking for you and find him? From the sounds of it, this guy is in the place you would have occupied, but his family tree is a bit different.
Come to think of it, how did your SI find him when your SI can't actually remember his real name?
----------
No, I don't believe the world has gone mad. In order for it to go mad it would need to have been sane at some point.
2) I don't get the concern over the counterpart. I suspect that most people on the planet have a close look-alike somewhere. Once you allow for age differences so that someone looks like an older or younger version of someone else, then the "twin" sets probably grow to include almost everyone.
Edit: For that matter, I don't get what you are trying to prevent with this makeover. Are you woried about people in Earth governments or inteligence agencies paying attention to the Masaki Household? Juraian nobilito or other extra-terestrials come looking for you and find him? From the sounds of it, this guy is in the place you would have occupied, but his family tree is a bit different.
Come to think of it, how did your SI find him when your SI can't actually remember his real name?
----------
No, I don't believe the world has gone mad. In order for it to go mad it would need to have been sane at some point.