This article is from the Final-Fantasy and other Square Soft Games FAQ, by email@example.com (Nick Zitzmann) with numerous contributions by others.
FF Tactics has a lot of parodies taken from previous games by Square.
Here's a few of them:
Deep Dungeon trilogy: Deep Dungeon
Final Fantasy: Gulg Volcano (Gurgu Volcano), Tiamat
Final Fantasy II: Parmekian Empire
Final Fantasy IV: Chocobo Forest, Baron, Gilbert (Edward), Tellah & Anna
Final Fantasy V: Boco the Chocobo, Ronkan (Lonkan) Ruins
Final Fantasy VI: Setzer & Daryl
Final Fantasy VII: Cloud, Aerith (Aeris), St. Elmo's Fire, Highwind,
(It's also been noted how Elmdor looks just like Sephiroth, Celia looks
like Scarlet, Lede looks like Elena, etc.)
This is an incomplete list. Has anyone seen any other parodies? If so,
send them to the maintainer.