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From Tekkenpedia English

Prototype Jack was originally a modified version of the first Jack robot. In Tekken 2, P.Jack received an upgraded appearance, with the removal of its rubber skin, adding sunglasses, and fitting of a 'normal' right arm in place of the drill, however the drill motion is still carried out into the right hand. In Tekken Tag Tournament, the appearance of P.Jack is modified on the second outfit, changing from blue to light brown, a reversed hat and no tank top.

Tekken

The player 1 costume in Tekken has P.Jack with green pants, rockets on the back and a large yellow drill for a right arm.

The player 2 costume has a spinning mace in place of the drill, and a visor similar to that of Geordi La Forge in 'Star Trek: The Next Generation'.

Tekken 2

The player 1 costume has P.Jack in a green hat, green tank top and green army pants, and green boots.

The player 2 costume is simply a palette swap of the first costume, this time with blue colouring. The reflection on the metal parts is also blue.

Tekken Tag Tournament

In Tekken Tag Tournament, P.Jack retains the same Tekken 2 player 1 costume, with improved graphics on the PS2 version.

P.Jack's player 2 outfit is new to the series and features a light brown colouring, a reversed hat, blue sunglasses and no tank top.