Reuben

Reuben is a playable E.S. unit that appears in the Xenosaga series. It is primarily used by Jin.

Description
Reuben is an E.S. specifically customized for Jin's use. Its focus is on close-range combat and as such it is equipped with up to two swords. It has a design emphasizing higher dimensional battle mobility with light armor and no shield. Due to Jin's unique battling style of combining offense and defense with his swords, this doesn't cause problems.

Episode III
Jin uses Reuben as his E.S. during Episode III, with Canaan acting as the sole co-pilot. It loses its Vessel of Anima at the Underground Ruins and is destroyed along with the other E.S. by Joshua when Zarathustra goes out of control. Reuben is then fitted with an engine crafted by the Professor that is capable of allowing the E.S. to operate normally. This engine is able to operate alongside the Vessel of Anima and is the reason that Reuben is still operational after the Vessels of Anima disappear with the Zohar in the final chapter of the game.