Question: Who was known for portraying four fictional characters: Ali G, Borat Sagdiyev, Brüno Gehard, and Admiral General Aladeen?

Context paragraphs:
The Dictator (2012 film): The Dictator is a 2012 British-American political satire black comedy film co-written by and starring Sacha Baron Cohen as his fourth feature film in a leading role.  The film is directed by Larry Charles, who previously directed Baron Cohen's mockumentaries "Borat" and "Brüno".  Baron Cohen, in the role of Admiral General Aladeen, the dictator of the fictional Republic of Wadiya visiting the United States, stars alongside Anna Faris, Ben Kingsley, Jason Mantzoukas, and an uncredited appearance by John C. Reilly.

Borat: Borat!  Cultural Learnings of America for Make Benefit Glorious Nation of Kazakhstan (or simply Borat) is a 2006 British-American mockumentary comedy film written and produced by British comedian Sacha Baron Cohen who also plays the title character, Borat Sagdiyev, a fictitious Kazakh journalist travelling through the United States recording real-life interactions with Americans.  The film was directed by Larry Charles and distributed by 20th Century Fox.  Much of the film features unscripted vignettes of Borat interviewing and interacting with Americans, who believe he is a foreigner with little or no understanding of American customs.  It is the second of three films built around Baron Cohen's characters from "Da Ali G Show" (2000–04): the first, "Ali G Indahouse", was released in 2002, and featured a cameo by Borat, and the third, "Brüno", was released in 2009.  The film is produced by Baron Cohen's production company, Four By Two Productions ("Four By Two" is Cockney rhyming slang for "Jew").

Brüno Gehard: Brüno Gehard (] ; sometimes spelled "Bruno" or "Brueno") is a retired satirical fictional character portrayed by British comedian Sacha Baron Cohen.  A flamboyantly gay Austrian fashion reporter, Brüno first appeared during short sketches on The Paramount Comedy Channel in 1998, before reappearing on "Da Ali G Show".  Following the success of "Ali G Indahouse" and "Borat", Universal Studios gained rights to produce and release a feature film, "Brüno".  Along with Baron Cohen's other character, Borat, Brüno has been retired.

New Hero of Comedy: New Hero of Comedy, also known as New Heroes of Comedy when covering more than one person, is a three-part documentary series on Channel 4, featuring the rise of famous comedians of recent times.  The series started on 22 February 2008.  The first episode covers the career of Ricky Gervais, the second Matt Lucas and David Walliams, and the last Sacha Baron Cohen.  The series received complaints before it was broadcast, with some people complaining that the people featured in the episodes are not "Heroes".

Da Ali G Show: Da Ali G Show is a British-American satirical television series created by and starring English comedian Sacha Baron Cohen.  In the series, Baron Cohen plays three unorthodox journalists — faux-streetwise poseur Ali G, Kazakh reporter Borat Sagdiyev, and gay Austrian fashion enthusiast Brüno Gehard.  These characters conduct real interviews with unsuspecting people, many of whom are celebrities, high-ranking government officials and other well-known persons, during which they are asked absurd and ridiculous questions.

Ali G: Alistair Leslie Graham, better known as Ali G, is a satirical fictional character created and performed by British comedian Sacha Baron Cohen.  Originally appearing on Channel 4's "The 11 O'Clock Show", and subsequently as the title character of Channel 4's "Da Ali G Show" in 2000 and on HBO in 2003–2004, he is also the title character of the film "Ali G Indahouse".  In December 2007, in an interview with "The Daily Telegraph", Baron Cohen announced that Ali G, along with Borat, had been retired.  However, Ali G returned at the 2012 British Comedy Awards to accept Baron Cohen's Outstanding Achievement Award, causing controversy by making jokes about Kate Middleton and Jimmy Savile.  Ali G returned to television with "Ali G Rezurection" in 2014.  Rezurection features new introductions by Ali G to some old highlights of Da Ali G Show.

Borat's Television Programme: Borat's Television Programme is a two-part compilation spin-off of "Da Ali G Show" by British television station Channel 4.  The show features Borat Sagdiyev (Kazakh: Борат Сағдиев , Russian: Бора́т Сагди́ев ; ] ) in the United States learning about the local culture and customs, much in the vein of the later movie "Borat: Cultural Learnings of America for Make Benefit Glorious Nation of Kazakhstan".  The two episodes contain Borat and Brüno segments from "Ali G in da USA", along with new and unseen interviews and shenanigans.

List of Da Ali G Show episodes: The "Da Ali G Show" is a satirical television series created by Sacha Baron Cohen that aired for three 6–episode seasons.  In the series, Baron Cohen plays three unorthodox journalists: Ali G, Borat Sagdiyev and Brüno Gehard.  The first season took place in the UK and aired on Channel 4 from 30 March 2000, to 5 May 2000, while the second and third seasons took place in the US and aired on HBO from 21 February 2003, to 22 August 2004, and are known as "Ali G in da USAiii" in countries the original season aired in.  All three seasons are available on DVD.  Three spin-off films: "Ali G Indahouse", "" and "Brüno" have also been released.  The show was a critical success and received a number of awards and nominations.

Brüno: Brüno is a 2009 British-American mockumentary comedy film directed by Larry Charles and starring Sacha Baron Cohen, who produced, co-wrote, and played the gay Austrian fashion journalist Brüno.  It is the third film based on one of Cohen's characters from "Da Ali G Show"; the first were "Ali G Indahouse" and "Borat".

Sacha Baron Cohen: Sacha Noam Baron Cohen (born 13 October 1971) is an English actor, comedian, screenwriter, and producer.  Baron Cohen is most widely known for creating and portraying four fictional characters: Ali G, Borat Sagdiyev, Brüno Gehard, and Admiral General Aladeen.  Like his idol Peter Sellers, he uses a variety of accents and guises for his characters.

Supporting paragraphs: New Hero of Comedy Sacha Baron Cohen
Answer: Sacha Baron Cohen