Adamantoise
Final Fantasy II. While Land Turtles are normal enemies, Adamantoise first shows up as the guardian of the Goddess Bell.
Ahriman
Final Fantasy III. A Crystal Guardian in the final area.
Behemoth
Final Fantasy II. First appears as a boss in the Arena.
Bomb
Final Fantasy II. Even back then they loved to explode!
Cactuar
Final Fantasy VI. Shows up in later deserts.
Cockatrice
Final Fantasy. Admittedly the FFXI version looks a lot different since they're featherless. First dungeon they show up in is the Earth Cave. Also the first opponent that petrifies you!
Coeurl
Final Fantasy II. Relatively lategame opponent.
Flan
Final Fantasy II. High physical defense, but magic works well!
Goblin
Final Fantasy. In the NA version they were called Imps.
Gigas
Final Fantasy. There are actually two candidates here, the Ogres and the Giants. FFXI giants more resemble Ogres, though.
Hecteyes
Final Fantasy II. They only show up in a couple of later dungeons. These also make an appearance in FF7, although they're called 8-Eyes there.
Iron Giant
Final Fantasy II. Rare encounter in the last dungeon, and drop rare loot.
Lamia
Final Fantasy II. Yep, they had charm here too. Queen Lamia is a midgame boss.
Malboro
Final Fantasy II. Instead of breath, they could inflict a bunch of statuses on regular attacks. The first occurrence of Bad Breath was in FF4.
Sabertooth Tiger
Final Fantasy. Titan's Tunnel has a lot of them.
Sahagin
Final Fantasy. Common encounter while riding the boat. Also pretty thick in the Sea Shrine.
Soulflayer
Final Fantasy. In the NES release, they were known as WIZARD (Piscodemon) and SORCERER (Mindflayer). Their Mind Blast move was added in FF4 (in which they were called Mage, despite the fact they don't cast magic...)
Spheroid
Final Fantasy IV. Late game boss is actually a big sphere and two smaller spheres. Fear the Globe99 death move!
Tonberry
Final Fantasy V. You could find them in Istory Cave rarely.
(Edit: Noticed I put wrong game on Cactuars XD Also went back and found Tonberry in FFV.)
Final Fantasy II. While Land Turtles are normal enemies, Adamantoise first shows up as the guardian of the Goddess Bell.
Ahriman
Final Fantasy III. A Crystal Guardian in the final area.
Behemoth
Final Fantasy II. First appears as a boss in the Arena.
Bomb
Final Fantasy II. Even back then they loved to explode!
Cactuar
Final Fantasy VI. Shows up in later deserts.
Cockatrice
Final Fantasy. Admittedly the FFXI version looks a lot different since they're featherless. First dungeon they show up in is the Earth Cave. Also the first opponent that petrifies you!
Coeurl
Final Fantasy II. Relatively lategame opponent.
Flan
Final Fantasy II. High physical defense, but magic works well!
Goblin
Final Fantasy. In the NA version they were called Imps.
Gigas
Final Fantasy. There are actually two candidates here, the Ogres and the Giants. FFXI giants more resemble Ogres, though.
Hecteyes
Final Fantasy II. They only show up in a couple of later dungeons. These also make an appearance in FF7, although they're called 8-Eyes there.
Iron Giant
Final Fantasy II. Rare encounter in the last dungeon, and drop rare loot.
Lamia
Final Fantasy II. Yep, they had charm here too. Queen Lamia is a midgame boss.
Malboro
Final Fantasy II. Instead of breath, they could inflict a bunch of statuses on regular attacks. The first occurrence of Bad Breath was in FF4.
Sabertooth Tiger
Final Fantasy. Titan's Tunnel has a lot of them.
Sahagin
Final Fantasy. Common encounter while riding the boat. Also pretty thick in the Sea Shrine.
Soulflayer
Final Fantasy. In the NES release, they were known as WIZARD (Piscodemon) and SORCERER (Mindflayer). Their Mind Blast move was added in FF4 (in which they were called Mage, despite the fact they don't cast magic...)
Spheroid
Final Fantasy IV. Late game boss is actually a big sphere and two smaller spheres. Fear the Globe99 death move!
Tonberry
Final Fantasy V. You could find them in Istory Cave rarely.
(Edit: Noticed I put wrong game on Cactuars XD Also went back and found Tonberry in FFV.)