Talk:Aqua/@comment-84.115.208.33-20170610205808/@comment-173.239.209.27-20170617184450

Aqua is naive, short sighted, and selfish. This combination makes her airheaded and in constant need of supervision. That being said, she is intelligent and innovative (the later of which requiring more than copying or memorization) in a number of subjects. She's a gifted architech and incredibly knowledgable in hydromechanics. Aqua would be an engineer's dream if you wanted to construct the world's largest electrical dam. The main issue and running gag is that the fields Aqua has mastery of are usless to Kazuma and the gang. In addition, even if you can find a use for Aqua's knowledge, you have to put up with her narcissistic personality and  condensending  remarks a s she helps or explains things to you.

tl;dr - Aqua is dumb because she's a pain in the ass and lacks common sense, not because she's an academic failure. For example  Aqua is great at mathematical computation, yet has no sense in economical financing, but can still surprise you when she pulls off a Ponzi scheme.