Major Demeziere Sonnen was an accomplished artillery instructor for the Principality of Zeon's armed forces in the years leading up to the One-Year War. However, when mobile suits were introduced as standard combat units, Demeziere Sonnen tested poorly as a pilot. He could only sit by and watch as his students left and became mobile suit pilots. During this time, Sonnen's usefulness was in question as artillery took a decreasing role in combat in light of the power and versatility of mobile suits. Eventually, Sonnen suffered a sort of breakdown. He recovered from the breakdown, but was beset by constant tremors that he kept under control with dope medicine he always kept on his person and would often be found with it in his hand.

The year is Universal Century 0079. Oliver May is a technical officer in the Zeon 603rd Technical Evaluation Unit , in charge of testing new military technology. Stationed in the Jotunheim, a civilian transport ship that was converted into military use, Oliver must head into battle and experience the One Year War, only this time from the perspective of a weapon tester who struggles to make an impact on an evolving war during changing times.
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(Source: Anime News Network)

Jecht from Dissidia: Final Fantasy (PSP) (Japanese)