Alright, given the new setup for alias and implication submission, here's what I've had standing:
IMPLICATIONS
final_fantasy_tactics → ivalice_alliance
final_fantasy_tactics_advance → ivalice alliance (inc. standing FFTA2 → FFTA)
final_fantasy_xii → ivalice_alliance (inc. standing FFXIIRW → FFXII)
Reason: While only RW and (seemingly) TA2 directly relate to previous entries, the whole endeavor of the Ivalice titles, sharing many similar elements, moreso than the FF series overall, seems enough to warrant a broad "that stuff" tag, in this case the Ivalice Alliance (as seen on recent releases and at the JP site).
dragonball_z → dragonball
dragonball_gt → dragonball
Reason: Character carry-over, same 'world', extension of first story. Par the course implication, far as I can tell.
final_fantasy_xiii → fabula_nova_crystallis
final_fantasy_agito_xiii → fabula_nova_crystallis
final_fantasy_versus_xiii → fabula_nova_crystallis
Reason: This is mostly provisional ATM (though there's on Versus that's 'disappeared'), and since I do not know if Versus and Agito directly relate to FFXIII, I'm proposing the same grouping as the IA above, in that they're obviously more related than the scattered FF-verses.
ALIASES
ben_tennyson → benjamin_kirby_tennyson
benjamin_tennyson → benjamin_kirby_tennyson
gwen_tennyson → gwendolyn_tennyson
Reason: Common names to full names (and the exclusion of a not-so-often-mentioned middle name in the "benjamin_tennyson" one).
EDIT: Added Tag A/I to the title.
Updated by Ephyon