Fox is an anime character?
either way i choose Suigetsu
Suigetsu is able to reduce himself to liquid form and to return to bodily form at will. This ability also allows him to change his body shape, giving him the ability to increase the size of his limbs, proportionally increasing his strength, if necessary. It also makes striking him somewhat difficult; since he is made of liquid, any sufficiently powerful strike will go right through his watery form. He is arguably quite powerful or at least very confident in his abilities, since he has threatened Sasuke on more than one occasion. Kisame Hoshigaki even commented on Suigetsu being a prodigy at the art of murder and the next Zabuza Momochi. Suigetsu is also the first ninja seen carrying water bottles on his outfit.