Bringing up this topic again, about implicating entries of a series to a series tag, with Dragon Quest in particular.
For DQ, I don't know a whole lot, but IV, V, and VI are being marketed here as a trilogy, and thanks to SydLexia.com, I know that I and III are connected, so perhaps the DQ games are coherent enough to get this implication set?
As for others, I know that I've gone on a Persona-tagging spree once/twice/a few times before, and I regularly check Final Fantasies, so I'm wondering if a lack of connection from title to title is really all that excluding from something like this.
The most obvious counter I can think of is to search, for example, "final_fantasy_*", but then I wonder how the DFF tag works into that, along with anything that's plainly "final_fantasy" (though trying "final_fantasy*" gives me doubles...).
Updated by Algasir