Why do you think the characters in FF games,have such big weapons?

[Croyles]

Yeah of course, Cloud is the ONLY character with a big weapon. :rolleyes2
Actually, you'd be able to find loads of characters with massive weapons since FF7, and at LEAST one in the FFs before then.

Squall definitely has some big swords.
Zidane definitely has some big swords.
Tidus definitely has some big swords.

FFX-2 Dark Knight: Longer than their bodies
FFVIII Squall: Wider that his head
FF7 Sephirtoh: No comment necessary
FF7 Yuffie: "Ouch, my foot."
FFVIII Ward: "Lets ram the castle gates!"

No weapon specialist could be able to wield those even remotely as good as the FF character wield them, and wouldnt be able to even LIFT some of them.

As for WHY they have them........ They look cool!