Because you like Nymphadora Tonks in Harry Potter Series
Big Boss is a disillusioned mercenary commander who wants to create a world for soldiers (and soldiers alone). See them in Metal Gear Series.
Barry Egan has too many anger issues to list here. See them in Punch Drunk Love.
Gou Matsuoka offers to help as manager of a swim team, believing that they're the only ones who can help her brother. See them in Free! Iwatobi Swim Club.
It's hard enough fighting a war. But it's worse for Commander Shepard, knowing no matter how hard you try, you can't save them all. See them in Mass Effect.
M. Bison is a diabolical megalomaniac hell-bent on dominating the world. See them in Street Fighter.
It's easy for Brian O'Conner to fake his way into the world of extreme racing because he's been popping cars since his teenage years. See them in The Fast and the Furious.
Kendall Roy is a wanna be ruthless businessman who comes across more like an anxious teenager. See them in Succession.
It's certainly easier to get great footage of crimes when you can guarantee they'll happen. See them in Nightcrawler.
After being resurrected and discovering his new morphing abilities, Alex Mercer uses them to combat the virus now ravaging New York. See them in Prototype Series.
A laid-back wanderer, Ginko has an empathetic, open-minded worldview. See them in Mushishi.
Spike Spiegel is a bounty-hunter with a laidback style and lightning-quick moves. See them in Cowboy Bebop.
After figuring out how both the light and dark halves of his soul could co-exist, Jak is maturing into a real hero. See them in Jak and Daxter.