post a picture of an アニメ character with an unusual weapon.

The Death Note isn't any ordinary weapon.. X3

Kagura's fan または Kanna's demonic mirror

Bleach have unusual weapons in general, though I find this weapon quite unusual... Even compared to other weapons, like Renji's Bankai and Komamura's Shikai and Bankai.

i don't know who she is but if あなた look closly あなた can see the blade looks like a bird beak.

well my maka is a weapon....and a meister. and she's rumored to be a witch.

Shu and Inori from Guilty Crown. Shu (the guy) is pulling a sword from Inori (the girl).
A very interesting anime, worth watching.

Kirby's best weapon... HIS STOMACH!!

Coyote Starrk
Sorry couldn't find a pic that could be easy to understand.

Dead Master from BRS and her scythe.

lenalee-chan from d gray man has boots for weapons~ :D

szayel from bleach has these wird wings that make vodo ドール out of people

Niche's Hair! From Tegami Bachi XD

Hmm..would ze claws of Lust-san's count as an unusual weapon?

I can't post pics right now, but I have a huge 一覧 of characters with weird weapons...

Ichigo Momomiya has a ピンク bell
Retasu Midorikawa has green castanets
Purin Fong has two tambourines
China has a 中華鍋, 目覚め and ladle
Amu Hinamori has a whisk, rollerblades, a baton, a conductor's stick, and a giant paintbrush
All of the マーメイド from Mermaid Melody have their voices
Edward and Alphonse Elric have alchemy
Envy has shapeshifting
Greed has his "ultimate shield"
Tadase Hotori has a yellow wand thing that shoots glowing pudding
Yaya Yuiki has a hoard of rubber duckies
Rima Mashiro has a tightrope and juggling pins
Kukai Souma has a skateboard and a サッカー ball
Blossom has a yoyo
Bubbles has a bubble blower
Sailor Moon has her tiara
Sailor Mercury has bubbles that create fog
Sailor Venus has a chain made of hearts

I could go on...

Do shadows count?

Kazuki Fuchoin uses white koto strings attached to bells as weapons :)

Crona can use his blood as a weapon.

Her nails