New copyright: Backbeard-sama_ga_miteru

The character Beako originates as a personification/daughter of Backbeard from GeGeGe no Kitarou, but the original creator torotei has also made their own little series called Backbeard is Watching.

Is it worth creating a new copyright tag for this character, then having that copyright imply original/gegege_no_kitarou? Or doing one of them fancy update BURs to tag the copyright along every present instance of Beako, even.

What I'd like to do is-

• Qualify backbeard-sama ga miteru as a copyright
• Garden Backbeako posts to remove original where there's no other copyrights present (Sometimes paired with other futaba channel characters), and in some cases remove gegege no kitarou.

However, by definition, Beako is Backbeard's daughter. This would mean any backbeard-sama_ga_miteru post would imply gegege_no_kitarou, as the character is a fan character.
By THAT extension, that also makes backbeard-sama_ga_miteru imply original.

So, I'm at a loss of what to do in that case. This would just end up creating a new tag that implicates more things and I'm not sure if this one character qualifies for her own copyright. While things like arai-san mansion got their own, this isn't on the same level of worldbuilding or character variety.