Because you like Lily Aldrin in How I Met Your Mother

For Celty Sturluson, it's rather upsetting to be the only headless girl in a city filled with full-bodied humans. See them in Durarara!!.

A resourceful ship systems engineer, Isaac Clarke does his best to batttle the infection spreading across space. See them in Dead Space.

With an A.I. as loyal and witty as Cortana, who needs humans? See them in Halo.

Don't worry about this forensic scientist offing you unless you're a serial killer yourself. (You're not, right? Just checking.) See them in Dexter.

Quint is a grizzled shark hunter with a love of the sea. See them in Jaws.

A courageous boy robot, Mega Man is dedicated to achieving everlasting peace. See them in Mega Man.

Fighting for a future without fear? Yeah, Chris Redfield believes it is worth it. See them in Resident Evil Series.

Hedwig is a lost soul with a punk rock spirit. See them in Hedwig and the Angry Inch.

Artemis Fowl understands the way of the world. If he wins, he's a prodigy. If he loses, then he's crazy. That is how history is written. See them in Artemis Fowl.

A powerful dragon-hunting warrior, Dovahkiin is destined for great things. See them in The Elder Scrolls V: Skyrim.

Katsa is a strong-willed young woman with a deadly skill set. See them in Graceling .

Raiden is an efficient soldier haunted by his repressed past. See them in Metal Gear Series.