DEMONS

As far as I can tell, Agaliarept's earliest mention is in the 1517 Grimoirium Verum or The True Grimoire The Most Approved Keys of Solomon, The Hebrew Rabbi, which states that he and the demon Tarihimal rule over Elelogap, a demon connected to water. The 1822 Le Veritable Dragon Rouge says that he is a general of hell, and that Buer, Gusoyn and Botis are subservent to him. It also has the only depiction of him that I know of besides the FF3 interpretation, and the two bear little resemblence to eachother. The earlier illustration, linked to below, could be interpreted as a tentacled monster, but it's actually intended to be a man's face.

Amon was an Egyptian wind god who was later worshipped as the ruler of the gods, and was depicted as a man, a ram or a man with a ram's head. Not much like the skeletal cavalier FF3 depicts him as, then. Amon is also classed as a demon of the Goetia, and this incarnation was more likely to have inspired the FF monster, but they're still very different. Reginald Scot's list of the Goetia demons in his 1584 book Discoverie of Witchcraft describes Amon thusly: "Amon or Aamon, is a great and mightie marques, and commeth abroad in the likenes of a woolfe, having a serpents taile, spetting out and breathing flames of fier; when he putteth on the shape of a man, he sheweth out dogs teeth, and a great head like to a mightie raven; he is the strongest prince of all other, and understandeth of all things past and to come, he procureth favor, and reconcileth both freends and foes, and ruleth fourtie legions of divils."

One of several names of a west Semitic fertility goddess. She's identified as a false god in the Bible several times (in 1 Samual 7:3 the prophet Samual forbids her worship), and so passed into demonology, including the Goetia. Discoverie of Witchcraft states that "Astaroth is a great and a strong duke, comming foorth in the shape of a fowle angell, sitting upon an infernall dragon, and carrieng on his right hand a viper: he answereth trulie to matters present, past, and to come, and also of all secrets. He talketh willinglie of the creator of spirits, and of their fall, and how they sinned and fell: he saith he fell not of his owne accord. He maketh a man woonderfull learned in the liberall sciences, he ruleth fourtie legions. Let everie exorcist take heed, that he admit him not too neere him, bicause of his stinking breath. And therefore let the conjuror hold neere to his face a magicall ring, and that shall defend him". FF's Astaroth definitely looks like a "fowle angell", but the viper is replaced with a spear and the dragon is gone completely.

Possibly inspired by the living walls from D&D. Living walls are created by evil mages from corpses, and, unless a "true sight" spell is cast, resemble ordinary walls. Anything killed by a living wall is absorbed by it.

Gaap is a demon of the Goetia. Discoverie of Witchcraft gives not only a description, but some lore surrounding him: "Gaap, alias Tap, a great president and a prince, he appeareth in a meridionall signe, and when he taketh humane shape he is the guide of the foure principall kings, as mightie as Bileth. There were certeine necromancers that offered sacrifices and burnt offerings unto him; and to call him up, they exercised an art, saieng that Salomon the wise made it. Which is false: for it was rather Cham, the sonne of Noah, who after the floud began first to invocate wicked spirits. He invocated Bileth, and made an art in his name, and a booke which is knowne to manie mathematicians. There were burnt offerings and sacrifices made, and gifts given, and much wickednes wrought by the exorcists, who mingled therewithall the holie names of God, the which in that art are everie where expressed. Marie there is an epistle of those names written by Salomon, as also write Helias Hierosolymitanus and Helisæus. It is to be noted, that if anie exorcist have the art of Bileth, and cannot make him stand before him, nor see him, I may not bewraie how and declare the meanes to conteine him, bicause it is abhomination, and for that I have learned nothing from Salomon of his dignitie and office. But yet I will not hide this; to wit, that he maketh a man woonderfull in philosophie and all the liberall sciences: he maketh love, hatred, insensibilitie, invisibilitie, consecration, and consecration of those things that are belonging unto the domination of Amaymon, and delivereth familiars out of the possession of other conjurors, answering truly and perfectly of things present, past, & to come, & transferreth men most speedilie into other nations, he ruleth sixtie six legions, & was of the order of potestats". I'm not entirely sure what FF3's Gaap is intended to be. It looks like a tentacled armadillo, or possibly a mangled cockroach. Either way, it clearly doesn't have "humane shape".

Glasya Labolas is another Goetia demon. According to Discoverie of Witchcraft "Glasya Labolas, alias Caacrinolaas, or Caassimolar, is a great president, who commeth foorth like a dog, and hath wings like a griffen, he giveth the knowledge of arts, and is the captaine of all mansleiers: he understandeth things present and to come, he gaineth the minds and love of freends and foes, he maketh a man go invisible, and hath the rule of six and thirtie legions". It's interesting to note that, while Bolfry, Gaap and Gomory are human-looking demons depicted as monsters in FF3, Glasya Labolas is a monsterous demon depicted as a human.

Lord Skylark sent me an E-mail clearing up some confusion about their names:

"About Hain.
In two offical Squaresoft books: they've listed him as both Hain and Hyn. So I don't know what is correct. But both are offical Square books.

In an offical Square book they list Zande as Satan Zande."

A Middle Eastern word for "money" or "wealth" which was used in the Bible, and not translated in the King James version.

"No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. Ye cannot serve God and mammon."
(Matthew 6:24)

"And I say unto you, Make to yourselves friends of the mammon of unrighteousness; that, when ye fail, they may receive you into everlasting habitations."
(Luke 16:9)

Vassago is another Goetia demon. S. L. MacGregor Mathers' The Goetia: The Lesser Key of Solomon the King states that "The Third Spirit is a Mighty Prince, being of the same nature as Agares. He is called Vassago. This Spirit is of a Good Nature, and his office is to declare things Past and to Come, and to discover all things Hid or Lost. And he governeth 26 Legions of Spirits, and this is his Seal". An image of his seal is linked to at the bottom of this entry. A description wasn't provided, however, so there's no way to tell how accurate Square's interpretation is, although it's clear that the idea that "This Spirit is of a Good Nature" has been thrown out the window.