I kind of amaze that people is saying Aizen
Agreed... all he was good at was trolling.. lol but we never saw him building robots, or even time machines.... if Aizen never created those two things then he is not a genius... right?
@Destinyheroknight: Yes... he is not the most intelligent... but like you said it is surprising that people chose him. All he was good at was to plan ahead before anyone and of course his smarts but it doesn't make him a genius... Urahara in the other hand or Kurotsuchi can be called geniuses... but the top ones in anime..
Would Van Hohenheim and Father count as one of the smartest in anime?? Van did invented Alkahestry and Father knew how to obtain immortality and also taught Hohenheim Alchemy... and also Scar's Brother since he was able to combine Alchemy and Alkahestry in one... thus creating a powerful Alchemy that not even Father him self could negate.. and also discovered that there was something wrong with Amestris and made an array that would reverse the spell...