|Alexei Barnes Alderp|
|Romaji||Arekusei Bānesu Arudāpu|
|• Professional Status•|
|Previous Affiliation||Kingdom of Belzerg|
|Previous Occupation|| Noble|
Governor of Axel
|• Personal Status•|
|Status||Trapped in Hell by Maxwell|
|Relative(s)||Alexei Barnes Walter (adopted son)|
|Light Novel||Volume 2|
|Japanese Voice||Nagasako Takashi|
Alexei Barnes Alderp (アレクセイ・バーネス・アルダープ) is a former noble and governor of Axel. He is maligned by Axel's citizens for being greedy, selfish, and an utterly corrupt noble.
Alderp is middle-aged and fat. He wears white gloves and red and blue clothes with golden stripes. He has long blonde hair and a blonde mustache.
Alderp's luck, perverseness, and cunning are equal to or possibly greater than Kazuma's own. In many ways, he is like the evil version of Kazuma, that does not care about his comrades or friends. He is seen has very corrupt and will use foul-play to get what he wants. This is seen in Kazuma's trial where he uses his position to have the judge call out Kazuma as guilty. When Kazuma calls out foul-play, Alderp simply states that Kazuma is just a worthless adventurer.
In the Light novel, he appears to be able to manipulate others using some sort of dark power. This is revealed to be due to the devil he summoned, Maxwell, who manipulated events to work in Aldep's favor.