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As an alphabet aficionado, I can make you laugh long into the night.
As a make of Japanese vehicle, I can keep your surroundings clean and beautiful.
As an execution apparatus, I make you laugh despite not maturing.
As a mixed-up romance, I lead tens of millions.
As a gardening tool, I provide weekend evening entertainment and provide guidelines for proposing.
As a reddish-brown meadow, I dazzle you with tricks.
As a fighting knife, I make popular music and navigate a maze.
As a speech-impaired aquatic athlete, I am your friend.
As a renter, I am your doctor.

Who am I?

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4  
Do they all give a single word? Or every sentence give single words and all those words constitutes to give a MEGA-single word? – manshu Mar 2 at 17:53
12  
@manshu Now why would I give extra clues only 10 minutes after the puzzle was posted? :) – GentlePurpleRain Mar 2 at 17:55
28  
-1 for click bait – CaptainCodeman Mar 2 at 21:38
19  
@CaptainCodeman What? Because it has the word 'naked'? Look at the top voted riddles on this site, and you'll see that this one isn't out of the ordinary. – Dmitry Narkevich Mar 2 at 21:41
10  
@CaptainCodeman +1 for clickbait. Clickbait answers always cheer me up. – Pharap Mar 3 at 5:04
up vote 58 down vote accepted

This is a compilation of many previous answers and adding of my own. Most of the credit to Paul Evans, Sleafar, charfellow, and question_asker (in no particular order).

The answer is:

David

You've probably seen me naked.

The Statue of David is a famous statue of King David in the nude. (from charfellow)

As an alphabet aficionado, I can make you laugh long into the night.

David Letterman, comedian and former late-show talk host. A letter man is an alphabet aficionado. (from question_asker)

As a make of Japanese vehicle, I can keep your surroundings clean and beautiful.

David Suzuki, environmental activist. Suzuki is a make of vehicle from Japan. (from question_asker)

As an execution apparatus, I make you laugh despite not maturing.

David Cross, comedian and actor on Arrested Development. A cross is an ancient method of execution, and not maturing = arrested development.

As a mixed-up romance, I lead tens of millions.

David Cameron, prime minister of the UK. Cameron is an anagram of romance. (from Paul Evans)

As a gardening tool, I provide weekend evening entertainment and provide guidelines for proposing.

David Spade, a comedian on Saturday Night Live and an actor in Rules of Engagement.
weekend evening entertainment = Saturday Night Live
guidelines for proposing = rules of engagement.

As a reddish-brown meadow, I dazzle you with tricks.

David Copperfield, illusionist. A reddish-brown meadow is a copper field. (from question_asker)

As a fighting knife, I make popular music and navigate a maze.

David Bowie, acclaimed singer, and actor in the movie Labyrinth. A Bowie knife is a popular knife originally made for fighting, and a maze is a labyrinth. (from Sleafar)

As a speech-impaired aquatic athlete, I am your friend.

David Schwimmer, actor on the TV show Friends. An aquatic athlete is a swimmer, which might be pronounced, "schwimmer" by someone with a speech impairment. (from charfellow)

As a renter, I am your doctor.

David Tennant, actor on the TV show Doctor Who. A renter is a tenant, and he plays the role of the doctor. (from charfellow)

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1  
"weekend evening entertainment" = Saturday Night Live – Josh Mar 2 at 19:48
14  
@GentlePurpleRain Looks like speaking German is considered a speech impediment nowadays. ;) – Sleafar Mar 2 at 19:51
2  
@Sleafar I don't speak German, or I might have used that in the clue. But from an English perspective, the clue still makes sense. – GentlePurpleRain Mar 2 at 19:52
9  
It should be converted into community wiki now.. :) – manshu Mar 2 at 19:55
2  
@Sleafar Except that in German it's pronounced "shvimmer", with a v sound, not a w sound. – ErikE Mar 3 at 0:46

As a mixed-up romance, I lead tens of millions.

Possibly David Cameron (anagram of romance) who lead tens of millions as the Prime Minister of the UK?

As a gardening tool, I provide weekend evening entertainment and provide guidelines for proposals.

David Spade comedian and star of Rules of Engagement

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2  
Aah, another anagram of romance. – ABcDexter Mar 2 at 19:05
    
Who you've probably seen naked? – user1717828 Mar 2 at 19:22
    
@user1717828 hahaha, we all can as Iggle Piggle! – Paul Evans Mar 2 at 19:28

To supplement others' answers, many have seen

The statue of David

naked

And

David Schwimmer played Ross on Friends

and

David Tennant plays the Doctor

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As a fighting knife, I make popular music and navigate a maze.

There is a Bowie knife, and David Bowie is a singer and was in the movie Labyrinth.

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A reddish-brown meadow who dazzles with tricks could be

David Copperfield

The alphabet aficionado who makes you laugh into the night is

David Letterman

The Japanese vehicle/beautiful surroundings is

David Suzuki

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