Because you like Nissa Revane in Magic: The Gathering

L is enigmatic, child-like, and one of the smartest people in the world. See them in Death Note.

Both intelligent and empathetic, Remus Lupin is worn down by the weight of a secret. See them in Harry Potter Series.

A wildly brilliant detective, Sherlock Holmes can figure out everything except how to interact with other human beings. See them in Sherlock.