Post your most intelligent anime character that you have ever seen?

Light Yagami

Lelouch Vi Britannia, highschooler/exiled prince that planned to manifest an army with only 9 people, establish a country, regain the throne he was exiled from, have the whole world hate him, and have his best friend "kill" him so his little sister can live in a more peaceful world and gave everyone on the planet the right to be free and to never be opresses.

Kisuke Urahara (Bleach)

Kudo Shinichi/Conan-kun from Meitantei Conan is very smart!

Loki from Matantei Loki Ragnarok
He's a detective :)
Much of these characters are detectives, aren't they?

hard question, i know of a few, but Kaito Kid the Phantom Thief, not even Det. Conan can catch him ;)

Well I would pick L, but that's already posted.

But other than that I would say that Shikamaru from Naruto is incredibly smart!

Matsu from Sekirei

Not only can she hack into top secret government bases and files , she can also hack into satellites , create special machines when given the parts , and always seems to be two steps in front of everyone else .

In fact in one episode just one I thought everything was lost Matsu comes out of no where with a back up plan * not giving spoilers on it * and basically helps bring hope back .

"Washu, you are a genius." From Tenchi Muyo related shows.

Fuji has the nickname "Tensai"(Genius) by his teammates from Prince of Tennis....