of Sherlock Holmes
, and his equal or better in mental power. However, Mycroft is extremely lazy and won't go outside of his home
, even to research a case
, so he calls in Sherlock when he wants legwork
done, and Sherlock comes to him for government-related information because of Mycroft's job.
Also a self-aware computer in Robert A. Heinlein's The Moon Is A Harsh Mistress, who named himself after Holmes' brother, but is usually called Mike.