The only help I can give is what I found on ffxi.somepage.com. It isnt much, but its all I can find so far, maybe you can formulate plans around the minute details included.
BCNM: Prehistoric Pigeons:
All four use Greater Bird and Soul Voice special attacks. When one is killed, the remaining ones are made more powerful. All are susceptible to Sleep, Lullaby, and Bind.
Copycat:
Osschaart uses Ahriman special attacks, Draw-In, and Charms party members about every 30 seconds. When it charms a new character, the old one is no longer charmed. It can summon Osschaart's Bat, Osschaart's Wyvern, and Osschaart's Avatar. Osschaart is susceptible to Lullaby and Silence.
Today's Horoscope
Aries uses: Ram special attacks; Stoneskin, Paralyzga. It is immune to Charm, but susceptible to Sleep, Gravity, Bind.
Double Dragonian (I'm not sure if this is the one you meant, but its the only one with a close enough name I could find) :
Both use Dragon special attacks. Both are susceptible to: Sleep, Gravity, Bind.
Berserker uses: Mighty Strikes, Body Slam, Chaos Blade (AOE Curse)
Minstrel uses: Soul Voice, Battlefield Elegy, Knight's Minne IV, Uncanny Etude, Army's Paeon V, Thornsong (100 damage per melee hit on it), Voidsong (AOE Dispel), Lodesong (AOE Gravity)
You probably know all this shit already, but I dunno. Maybe it can help. Its all i've found so far, i'll keep looking though.