Because you like Princess Bubblegum in Adventure Time
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.
Rainbow Dash's interests include flying, playing pranks, and generally being themost awesome pony around. See them in My Little Pony.
Linda Belcher doesn't prescribe to what society deems as "normal." She narrates her life through song, much to the alarm of everyone nearby. See them in Bob's Burgers.
Protecting Earth from mystical threats and training new members, Ancient One has her hands full with her latest recruit Stephen Strange. See them in Marvel Cinematic Universe.
The witty Aku would be an ideal dinner guest, if he weren't a demon. See them in Samurai Jack.
Mabel Pines loves sparkles, animals, friendship, and fun. See them in Gravity Falls.
Ursula will oh-so-generously grant your wishes for a price. See them in The Little Mermaid.
C is for cookie, and that's more than good enough for him. See them in Sesame Street.
Anger is a cantankerous hothead whose job is to get others riled up. See them in Inside Out.
Matilda Wormwood is so smart, she taught herself how to be psychic. See them in Matilda.