‚ÄčLeon: The Professional (1994)

Barely helpful plot summary:

Jean Reno babysits Natalie Portman because her family is dead. Also, sometimes he teaches her how to kill people. 

Associated people:

Danny Aiello

Michael Badalucco

Gary Oldman

Natalie Portman

Jean Reno

Luc Besson

Similar films:

The Fifth Element (1997)

Kiss of the Dragon (2001)

Lucky Number Slevin (2006)

The Punisher (2004)

Taken (2008)

The Transporter (2002)