Because you like R2-D2 in Star Wars Series
Fiery and adventurous, Amy Pond is the sort of woman you'd want by your side on a journey through time and space. See them in Doctor Who.
Tail's smarts and helpful nature come in handy in a pinch. See them in Sonic the Hedgehog.
Handsome Jack is wearing a mask of his own face to hide his scarred real one. See them in Borderlands Series.
A grumpy tourist trap owner, Grunkle Stan has a few deep secrets. See them in Gravity Falls.
Waylon Smithers would do anything for his boss, and would love to do a few things *to* him. See them in The Simpsons.
Ciri had a princess upbringing, and some of the facts of common people's lives are a mystery to her. See them in The Witcher.
Alex Danvers is a brilliant engineer tasked with alien threats, and one of those aliens is her adopted sister Supergirl. See them in Supergirl.
Everything is fascinating to Octavia Blake who has been locked away for her entire life. See them in The 100.
Princess Bubblegum is brilliant and determined, but can display a nasty temper. See them in Adventure Time.
Scooby-Doo always keeps his priorities in order: eat snacks first, solve mysteries later. See them in Scooby-Doo.