Amoeba is rather tall, skinny, with a womanly body and long limbs. He has a skeletal face, topped by a shock of unkempt, greenish hair. He has a small chin and thick purple lips. The most striking feature of his face are his eyes: the sclera, iris and pupil of his right eye are completely yellow. The other is covered by a visor.
In the Heaven's Arena, he wears golden bracelets and a matching golden collar, a white and azure striped shirt that leaves his belly bare, a white belt with a round golden buckle, dark blue jeans, possibly with bell bottoms, and brown shoes. The right sleeve of his shirt is longer and baggier to hide a small cannon. On his chest, the stripes form the motif of a vortex.
Not much is known about Amoeba's abilities, but the fact that he was a Floor Master is proof enough of his power and proficiency in Nen. Still, he was defeated single-handedly by Jed's followers. When fighting Gon and Killua, he is shown to fire an unknown liquid from his right sleeve at high pressure. Whether this is a form of Nen or a hidden weapon, is yet unknown. In the magazine held by Killua, he is seen dodging an attack by leaping backward over his opponent, demonstrating a good deal of agility.
Amoeba Attack (Ameeba Kougeki): Amoeba shoots a liquid from his palm. Whether it damages the opponent with its pressure or it has other effects, is unknown.
Mikawashi (possibly "Double Exchange"): When attacked, Amoeba dodges by somersaulting over his opponent, landing behind them. "Kawashi" is sometimes used in martial arts to indicate a reaction to a blow in which one does not block or move away, but rather goes toward the attacker and trades places with them.