|Game||Tales of Vesperia|
|Occupation||Commandant of the Imperial Knights|
|Japanese Voice Actor||Jurota Kosugi|
|English Voice Actor||•D.C. Douglas|
Alexei Dinoia (アレクセイ・ディノイア Arekusei Dinoia?, "Alexei Denoia") is a primary antagonist of Tales of Vesperia. Alexei represents his country's government as the Commandant of the Imperial Knights. His personal brigade is known officially as the Royal Guard.
During the previous Emperor's reign, Alexei entered and won a tournament. As a result, he was accepted into the Imperial Knights as reward. As Alexei climbed in ranks, he became well-known and revered for his ideals, gaining the respect and support of many of his fellow knights, including Schwann Oltorain, as well as the townspeople. In his spare time, he researched vigorously for ways he could achieve his goals, and at some point, discovered the true nature of the blastia, as well as the nature of the imperial family, and sought a way to use the information to help with his dream.
However, as time passed, Alexei grew more and more weary with the injustices of the world, and he became more obsessed with changing things. Eventually, he began to believe that the only way to change things was to purge the world of its "scum", and decided that the only way to do so was to unleash calamity into the world. As he made his plans, he gained followers and continued his research. He also began to experiment with blastia, one such experiment being the usage of blastia to support the life of those who would otherwise be dead.
During the Great War, Alexei would fit fallen soldiers with blastia to replace their heart, and if successful, he would use the individuals to do his bidding. The two most notable successful subjects were Yeager and Schwann. The latter would eventually turn on Alexei and bring about his downfall. By the time of the events of the story, Alexei had become Commandant of the Imperial Knights and was prepared to execute his plans, with Khroma being his only fully informed confidant. His ambition took him to betraying the Knights and the government, but due to his promises of a changed world, he had recruited many knights to his cause without them knowing the true nature of his plans.
Enduring Shrine of Zaude
At Zaude, the party finds Alexei in the deepest level, trying to figure out the formula to make it work. Alexei attempts to retreat to the top of the structure, but the party finally attacks and confronts him. Alexei is defeated, but while fighting the group, he is still analyzing Zaude. Alexei tries to activate it, only to be stopped by Yuri Lowell. Everyone then witnesses the Adephagos's arrival and death of Alexei, who was injured by Yuri and ultimately crushed by the core of Zaude. The shrine of Zaude is not a weapon like Alexei thought. Rather, it is a barrier the ancients used to seal away the Adepaghos, since they were not able to destroy it. Flynn Scifo claimed Alexei's position after his death.
As expected from the Commandant of the Imperial Knights, Alexei is shown to be a formidable combatant and can be considered one of the hardest bosses in the game. He has an array of powerful melee attacks, such as Ill Wind, Apocalypse Toll (時練爆鐘 Jiren Bakushou?, "Time Practice Bomb Bell"), Guardian Frost, Radiant Dragon, Grave Worm (破邪地竜陣 Haja Chiryuujin?, "Exorcism Earth Dragon Formation"), and Raging Ice Fang. Alexei is also known to have very dangerous spells like Tidal Wave and Holy Rain. Alexei's most devastating attack is his mystic arte, Brilliant Cataclysm.