{Note: Massively Revised 7/8/2019}
Gary Oldman, in a titanically twisted, iconic, canonical, epoch-defining performance, portrays psychopathic, corrupt DEA agent Norman Stansfield in the film Léon, The Professional. Stansfield really gets down to some serious malevolent weirdness in the above video scene with would-be DEA agent-slayer Mathilda (Natalie Portman). He calmly interrogates the young lady in ways that would bamboozle, unnerve, and intimidate anyone in human history. Throughout, the crazed but {mostly} composed DEA agent manages to be one moment menacing, the next pleasantly conversational. Stansfield presents an enigmatic, occasionally humorous, malevolent-ly inclined figure. Quite unforgettable.
In The Fifth Element, Lost in Space, and True Romance, he displays the ability to simply do anything he wants as an actor. All 3 roles are quasi-humorous/sinister, but in entirely different ways. Masterful.
Bideodromage 