Ok, some interesting info from the data (assuming this is correct).. some of which worth pointing out:
Hand of the Gods: Holy elemental, effective against Ghouls and Undead
Apollo's Harp: Fire elemental, effective against Dragons
Thor's Hammer: Lightning elemental, effective against Mechs
Lightbringer: Holy elemental, effective against Ghouls and Undead,
back row compatible 
Flandango: effective against Flan
Abel's Lance: Lightning elemental
(not Aerial elemental like all the other lances) 
Fiery Hammer: Ice elemental, effective against Mechs
(description of the elemental info lies) 
Sage's Robe: protection against Mute, Mage attacks
Asura's Rod: Holy elemental
Mist Whip: Holy elemental, inflict paralysis, back row compatible
Perseus Bow: Aerial elemental, backrow compatible (nothing really special about this bow)

Dragon Claw:
Holy elemental, effective against Dragons (a cheap copy of FF6's Dragon's Claw)

Loki's Lute: effective against all enemy types except Flan, back row compatible
Rising Sun: Aerial elemental, back row compatible
Gigant Axe: inflict poison (it won't kill Giants like the Poison Axe... meaning it is nothing special)

Hero's Shield: Absorb attribute
Rainbow Robe: protection against Fire, Ice, Lightning, Holy
White Dress: protection against Mute, Berserk, Ghouls, Undead
Maximilian: protection against Stone, gradual petrification, Mechs (wow, only armor to have this attribute)

Caesar's Plate: protection against Darkness, Holy
Dragoon Plate: protection against Fire, Ice, Lightning (no Dragon protection though)

Vishnu Vest: protection against Fire, Ice, Lightning, Darkness, Holy
Requirem Harp: Drain attribute, effective against Giants, Flan, Undead (it looks like a Blood weapon clone...?)
