Hi, this is a weapon i made myself, if u wish to make ur own zampaku-to, go to this link below
http://groups.imeem.com/HNvIjOSK/forums/hUufNigP/aeL3enPf/zanpakuto/
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Name: Akurei Kage (demon shadow)

Command: Consume them, Akurei Kage

Shikai form: zampakuto turns to shadow and spreads onto arms to create a shadow armor for arm and grows shadow blades on knuckles and increases strength 10 fold. Scratched by claws once, shadow spreads through u like venom very fast and shadow appears over the scratch, scratched twice where shadow is visible, it will make u a puppet to the user (only 3 puppets maximum, anymore the first will be free).

Bankai form: new name is Akurei Gekido Kage. Shadow covers the whole body but the face (parts of the head has shadow on it), shadow spikes forms on arms and legs, shadow claws form on feet, claws on hands form into 2 shadow dual swords, and strength increases from 10 to 20 fold. In banki form, the user can switch strength with speed at will, though the user can't control anyone. Only in banki form, the user can hide and teleport through any opponents shadow, but can only stay in shadow for a short time. Can grow shadow wings to escape at the cost 40% of the users speed. When the user is using shadow swords, he/she can summon up to 7 clones of him/her self creating them out of shadow arround them.