THEMILKMAN said:
Examples: Buster Sword, Gunblade, Keyblade, Brotherhood (FFX's bubbly sword). And any other odd weapons from any JRPG, not just ones made by Square.
I gotta go with Sephiroth's sword, any sword that thin and long could never be swung right. Everytime one would swing it it would wobble through the air like a MFer.
Ok. time for fanboy education: The buster sword wasn't ridiculous in VII. It has steadily gotten larger in subsequent things. And it's awesome.
Gunblade as it appears in 8 is dumb. Subsequent reimaginings (a pistol with a sword on) are heavily practical. If you don't believe me, ask any Cervantes player.
The keyblade is magical, and used to attack magical beings. Practicality can and should be ignored. If it bothers you that much, replace it with a claymore in your mind.
Brotherhood is only impractical because of the way Tidus holds it. Hook end may not be the best idea for a quick hitter, Tidus.
The Masa is made of metals not found in our universe, and made in such a manner as to prevent said wobbling.
Now, as for my choice, the Oversized Sword is a strong contender, but I'm gonna give this one to the Submachine gunkatanas Weiss the Imacculate uses in Dirge of Cerberus. Shit makes no sense.