Mewtwo is a bipedal, humanoid feline creature with purplish-gray skin and a long purple tail.

Head and FaceColor: Purplish-gray skin with solid purple eyes.Horns: Two short, blunt, horn-like protrusions on top of the head.

Spinal tube: A tube connects the back of its skull directly to the top of its spine, bypassing the neck.

Torso

Chest: Defined chest and shoulders that resemble a hard breastplate.

Underbelly: A large light-purple patch covers its stomach area.

Limbs and Tail

Hands and feet: Three rounded digits on each hand and foot with spherical tips.

Tail: Thick at the base, thinning out in the middle, and ending in a small round bulb.

Mega Mewtwo X is a larger, more muscular, and heavily armored version of base Mewtwo, gaining a dual Psychic/Fighting type.

Head and shoulders

Eyes: Switch from solid purple to light blue.

Horns: The two blunt horn-like protrusions on its head grow longer and more pointed.

Shoulder Armor: Raised, curved external growths form bulkier, organic shoulder pads that flank its neck.

Torso and Muscle Build

Chest: The upper torso expands with a highly defined, chiseled, armor-like breastplate structure.

Underbelly: The central light-purple patch expands slightly across its muscular abdomen.

Limbs and Tail

Arms and Legs: Grow considerably more elongated, thick, and physically imposing.

Joint Bands: Distinct, ridge-like cuffs or rings encircle its wrists and ankles, emphasizing its physical fighting nature.

Digits: The hand and foot digits remain rounded but become longer and more defined for striking.

Tail: Becomes shorter and loops tightly upward behind its back, ending smoothly rather than in a bulb.

Mega Mewtwo Y is a smaller, sleek, and streamlined version of Mewtwo. It sheds its bulky physical traits to maximize its Special Attack power and psychic potential.

Head and Face

Eyes: Change to a sharp, crimson red color.

Head Growth: The back of its skull elongates into a massive, backward-curving crest resembling a large crescent or handle.

Spinal Tube: The original neck-to-spine connection disappears entirely, giving it a much cleaner profile.

Torso

Size: It shrinks significantly in height, losing its towering, humanoid proportions for a lightweight, alien look.

Chest: The armored chest definition smooths out into a small, elegant white torso.

Limbs and Tail

Hands and Feet: It retains three digits on its limbs, but they become bulbous, teardrop-shaped spheres clustered tightly together.

Tail Relocation: The most dramatic shift—its purple tail completely moves from its lower torso to the back of its head.

Tail Shape: This head-tail loops gracefully downward, extending well past its feet, and terminates in a distinct, rounded bulb.