Because you like Bernadette Rostenkowski in The Big Bang Theory
James Wilson is a compassionate doctor who willingly plays the sidekick. See them in House M.D..
Nick Carraway is the perfect observer: always there for the events, but never too involved. See them in The Great Gatsby.
Greg Heffley will be famous someday, but now he's stuck in class with morons. See them in Diary of a Wimpy Kid.
Louise Belcher might be just a kid, but she can manipulate just about anyone with a pulse. All in the name of fun, of course. See them in Bob's Burgers.
Caitlin Snow believes that burying herself in science is the best way to save the day or to mend a broken heart. See them in DC Extended Universe.
Chuckie Finster is a baby afraid of everything from clowns to closets, unless his best friend's by his side. See them in Rugrats.
A passionate paleontologist with interests no one seems to share, Ross Geller tries to find love despite his past of abandonment and an awkward personality. See them in Friends.
This master marksman may be a villain, but Deadshot's motives aren't quite as selfish as they seem. See them in DC Extended Universe.
Jo Wilson is an accomplished doctor who's getting over her past. See them in Grey's Anatomy.
Bumbling, jolly, and loyal, Rubeus Hagrid has the uncanny ability to make the best of a bad situation. See them in Harry Potter Series.