I took one of those online tests and it turns out I'm Dr. Watson from The Adventures of Sherlock Holmes.
Here's the description from the site.
You might prefer the company of one good friend to a crowd but, despite this introversion, you maintain an offbeat sense of humour your friends and colleagues love. Even though you place trust in a sense of law and order, you are flexible enough to blur lines should your friends ask for a spot of burglary in an excellent cause.
On tough days, when you’re suffering from certain over-bearing colleagues, you might feel inadequate and defensive. However, you balance this with good intuition and often surprisingly good people skills, not least your fierce loyalty to friends.