Elsewhere: King Li Ying
Tales of Xillia 2 reveals in snippets from word of Gaius' mouth that he and Wingul have a peculiar relationship. Evidently, there was more to them than a professional exchange between the king and his right-hand man. Between their jingles and Gaius knowing the secretive tongue of Long Dau reserved for its elite members (leaving the only explanation that Wingul had taught him), they were the best of friends despite Gaius' hesitation for the term.
The fractured dimensions featured in the sequel center around the differences in perspective between Gaius and the Chimeriad during the former's character episodes. Wingul seems to have inherited his mother's fortitude of the mind: A victim of paranoia, his first alternate counterpart is found in mental shambles over his broken relationship with Gaius. Here we see the gap between Wingul and Gaius as rulers: Whereas Gaius withstands the lonely test of being a king, Wingul is unfit to rule in his deteriorated mental state, which is further exacerbated by his self-imposed loneliness.
Wingul: Hmph . . . More would-be assassins vying for my head. Rest assured. No guards shall fly to my rescue. I'm a lonely king who deserves to die.
Where Wingul was mostly in a position to show off his cool logic during the events of Tales of Xillia, his emotional side takes the reins in the sequel by shocking contrast. More importantly, Wingul's priorities rank Gaius above Auj Oule, while Gaius puts their country above all else. In spite of his numerous qualifications as a politician and a leader, Wingul should not be king for this reason.
Wingul displays some brazen habits in another fractured dimension where he makes a minor appearance, including throwing his sword at an eavesdropper like a clearly sane person. The definition of "acting before thinking," he disarms himself for the sake of revealing potential spies. Something doesn't add up here, but it's Wingul, so maybe he just happened to be carrying two swords.