Because you like Kim Possible in Kim Possible
Running away from murderous aliens has turned into an interstellar chase for Jupiter Jones. See them in Jupiter Ascending.
Usagi Tsukino may look like a lazy teen, but when Usagi conjures up her alter ego and calls her Sailor Scout team, no villain stands a chance. See them in Sailor Moon.
A few millennia in the mortal realm have caused DEATH to be quite enamored of life. See them in Discworld.
Gruff and efficient, Sam Fisher protects a nation that can never admit he exists. See them in Tom Clancy's Splinter Cell.
With each reboot, Janet progresses more and becomes capable of human emotions. See them in The Good Place.
Yuki Cross is a cheerful, funny, bold young woman with hidden insecurities. See them in Vampire Knight.
Basil Hallward is dominated, soul, brain, and power by Dorian. See them in Dorian Gray.
Leone Montana is a fearless hitman with a surprisingly sensitive side. See them in Leon: The Professional.
It is a truth universally acknowledged that Elizabeth Bennet doesn't suffer fools or prideful men. See them in Pride & Prejudice.
Daring on a bike but haunted in his personal life, even Johnny Blaze isn't fast enough to outride his past. See them in Ghost Rider.