I was thinking when u buy weapons u get a weapon stat. such as

Katana skill- this affects how much damage u do , how often u hit and how fast u slash.

Here is a list of weapons- Head Cleaver sword=Zabuza Sword
                                - Kisames Sword
                               -Giant Kunai (they are melee weapons used by leafnin Kotetsu)
                               -Nunchaku
                               -Chakra Knuckle knives- when u have wind element u get a jutsu that extends the blade in chakra form boosting damage.
                              -Zanbatou-Used by a fuuma clan member
                             -tanto-a small blade- if ur hatake clan u get that Hatake tanto that makes u glow white when u attack with it.
                              -retractable Wrist blades-Used by the ninja that killed Obito
                              Here are other weapons that have extra req other that buying them.

Sound amp-Wrist weapon used by Dosu - u have to be a non-Clan sound nin- boost tai and nin- makes attacks cover 3 spaces in front of u.

Air Vents- imbeaded weapons-requires non-clan sound nin and talk to orochimaru - gives nin boost and a very powerfull jutsu. jutsu is really power ful

I will post more later but im tired of typing now.
all my info comes from    http://www.leafninja.com/personal-weapons.php