Kiro Kiro no Mi

Information
The Kilo Kilo Fruit (キロキロの実, Kiro Kiro no Mi) retains its Japanese name. It allows the user to change their weight from 1 to 10,000 kilograms. In the 4Kids dub, kilograms are replaced by pounds. "Kilo" is the short version of Kilogram that multiplies a unit by a thousand. Eaten by Miss Valentine.

Strengths and Weaknesses
This fruit allows the user to change their weight at will. They can go from being light enough to float on the wind with an umbrella, to 10,000 kilos or more.

This fruit doesn't seem to have any specific weaknesses, aside from the standard Devil Fruit weaknesses.

Attack List

 * 10,000 Kilo Press / 10,000 Kill-o-Press (一万キロプレス) (10,000 Pound Press): First Miss Valentine makes herself weigh one kilogram so she can use her umbrella to float above her opponent to aim her attack. Then, when she's directly over her target she rapidly increases her weight to 10,000 kilograms and crushes her opponent flat.
 * Hissatsu 10,000 Kilo Guillotine (一万キロギロチン) (Sure-Killing 10,000 Kilo Guillotine): Similar to the 10,000 Kilo Press only this time aims for the opponents head or neck and she drops down with one of her legs extended straight out towards to either smash or cut off the opponent's head.  This technique was removed in the 4Kids dub.
 * 5000 Kilo Press (五万キロプレス):Similar to the 10,000 Kilo Press only with 5,000 kilograms used.
 * Crescendo Stone (強くなる石（クレッシエンド ストーン）): A torturing technique. Miss Valentine sits on her opponent and slowly increases her weight, usually in intervals of 100 kilograms, until she crushes them like a bug. This technique was also removed in 4Kids dub.

Links

 * Weight - Wikipedia entry on ability controlled by Miss Valentine's Devil Fruit