OK, here are your winners!
What we're going to do is construct the query now - i'll get started on this later today, but you can provide ideas right now. what we need is a paragraph for each one, that briefly describes its appearance, abilities, and some behaviors/tendencies. Some of them are started already, thanks to the kind contributor who first nominated them, while others need to be started from scratch. have at them!
Bionoid - Spelljammer MC9
Clockwork Swordsman - MC Annual 4 (& SCMC)
Dabus - Planescape campaign boxed set
The manitainers of Sigil who spoke with visual puzzles. Might make sense to expand their duties tp places elsewhere as well.
Demarax - Planescape Monstrous Compendium Appendix II
A lizard-like creature with hundreds of tiny crystals embedded in its dark hide. The demarax roams slowly across the outer planes feeding on the spell crystals that are the manifestation of summoning spells in the planes. Highly magic resistant, demaraxes are usually non-hostile, but can defend themselves with their tails, by shooting magic missiles from their three eyes, or by releasing a storm of spell crystals. Although pretty dumb, Demaraxes live for thousands of years and can perfectly recall every conversation they've ever had, making them a potential source of information for planar adventurers
Firelich - Spelljammer MC II
Garmorm - Planescape MC III
A vast floating worm native to the Astral Plane, the garmorm absorbs creatures into it with a song - creatures that fail to resist have their soul swallowed and join the choir of faces that cover its body. They are also accomplished spellcasters from all the souls they've absorbed over the centuries, and have a powerful bite.
Gautiere - Planes of Conflict
The deicide cursed remnants of the Tiere, bottled up within Minethys on Carceri
Great Elder Wyrm - Dragon #94
Linqua - Planes of Conflict
Linqua are the servitors of Sung Chiang, the god of theives from a Chinese mythos. Short squat humanoids tufted with green hair, they recieve the blessings of their creator in clerical spells, the ability to gain a burst of Strength (rather like the Strength domain power) and sneak attack. Despite their divine origin, linquas often escape the service of their master. These rogue linquas often make for powerful clerics, as they become addicted to the divine energy imbued by serving a god.
Mapmaker - Dragon 47
Odd humanoids from Pandemonium who love maps
Moilian Heart - Return to the Tomb of Horrors
A disembodied human heart trailing arteries and veins in a sinister tangle. These undead creations of the necromancer Drake of the Black Academy of Moil remain inanimate until a living creature approaches. Then they drain life force and begin beating, animating those that they kill as Moil zombies (bleakborn in Libris Mortis). Although a molian heart has no physical attacks, it can project a wave of frost at neaby enemies.
Mole Dragon - Dragon 272
Wicked dragonets related to the pseudodragon, mole dragons have thick bodies and short tails. Their claws are huge and adapted to digging through earth and stone, and its hide is encrusted with gemstones. They have no breath weapon, but can summon earth elementals and cast spells as a cleric. They occasionally cooperate with derro and duergar and tend to be dour and sadistic.
Ni'iath - Planes of Conflict
Long, wormlike creatures with vicious mouths and four narrow eyes spaced equidistantly about their heads. Natives of Bytopia, ni'iaths have a peculiar immunity to gravity and no concept of "up" or "down". They have a barbed tail and a special reverse gravity fling they use to propel opponents into nearby objects. Ni'iaths resemble wolves in mentality, hunting in packs, often tiring prey out before closing to attack.
Piranha Bats - Dragon 51
Poltergeist - Dragon #55
Not the same as the poltergeist from the 1e Fiend Folio, but the spirits of chaotic gnomes from Limbo and Gladsheim (Ysgard), I guess they would be greater poltergeists
Rohch - Monstrous Compendium Appendix 11: Forgotten Realms
The rohch is an unspeakable (or at least unpronounceable) crossbreed between a beetle and a wolf. Creepy things.
Stwinger - Monstrous Compendium Fiend Folio Appendix (MC14)
Thrax - Dark Sun, Terrors of the Desert
Tirapheg - Fiend Folio
Utukku - Dragon #89/SCMC
Wastrel - PSMC
Life sucking, raven-like birds from the Gray Waste
Wraithworm - Planescape Monstrous Compendium
Giant snake that can become incorporeal and drain levels