A Masterpiece: A mirror or an ABC?

I have worked on this masterpiece for soooo long, hope you all like it!

The PUZZLE

A is for the adventurous who approached the door
B bragged his brilliant bronze when there isn't even one
C is the Chinese classifier living with a chimpanzee
D is the detective against the diamond maze
E stands for excellent with no questions, only explanations
F is the one who finds nothing in "fishy"
G goes round and round on the ground
H can hop from here to there, if only he himself is here
I has the illustration to replace the il-favoured nails
J's done a puzzle (again) in "5,0,1"
K is a kutie disguised in a quart
L looks into life with layers of pixels
M is for the master who managed to find the modest
N is nothing naughty with the apple-beaten curious dog
O likes to play with Optimal Prime
P plays with the periodic table with a poor professor
Q keeps the quack away with qi queer apples
R renders riddles with rations of word
S, stealthy, should show off his small art with score 0
T finds a trench in a thread
U would be unsatisfied if he lived in an unitone universe
V is for the virtuoso in making veiled veiled clues
W would vision two countries in one
X is a xpectrum xeen from above
Z knows well sZYX, in Greek as well, itz here, you zee?

Disclaimer

Sorry in advance if you feel in anyway offended, and please feel free to tell me in the comments!

Criteria:

The accepted answer should also provide the links (if you know what I mean) and

Y is Y missing?

Sorry

As mentioned by @GarethMcCaughan♦:

There is no specific rule in which of the list I chose...
I was going to follow a rule, but that would be too difficult for my puzzle making...
Therefore, some are easy, some are hard...
Enjoy!

Edit:

There's a threshold to make our lives easier, and it can loosely be called a 'rule', or a limit at least

HINTS:

I am lazy. I go through the user list in PSE. I look for one starting with the letter required, then try to make a riddle out of him/ her.

D: (couldn't believe this needs a hint)

twisted deceitful diamond

I:

N:

Such a cute racoon!!!

S:

I steal stuff from far away...

T:

Where can we find a hole in a thing with a hole in it?

U:

pɪƐ

V:

"Voila! There it is!"
What can you hear?

V Hint 2:

W:

'll

Overall:

Dear senpais of PSE: reflect on your life! What have you contributed in PSE?

HERE IS A RECORD OF YOUR PROGRESS:

• Rot13(Vf gung fhccbfrq gb or Bcgvzhf Cevzr?) - line 15 Jan 15 '19 at 14:20
• No it is fine as it is Jan 15 '19 at 14:41
• Y is missing :o Jan 15 '19 at 23:38
• Y is Y missing anyway, @OmegaKrypton? Feb 11 '19 at 14:47
• no user with first letter y and rep >1000 @KradCigol Feb 11 '19 at 14:51

Here is a more complete solution with the contributions from me, Gareth McCaughan, Bass, jafe, TwoBitOperation, QuantumTwinkie, Krad Cigol, El-Guest and the OP, Omega Krypton

A (found by Gareth McCaughan)

B

C

Chowzen Do I Work with an Orangutan?

D (found originally by Gareth McCaughan, but also subsequently by QuantumTwinkie and Krad Cigol)

Deusovi - Deusovi Honeypot

E

El-Guest, a user who has accumulated all their points from answers and not asked a single question.

F

f'' - this answer - was on the right track but they did not find the appropriate letter in "FISHY DISH" to solve the clue.

G (found by QuantumTwinkie)

H

I (revealed by Omega Krypton)

itriedacrab - Sometimes I'm ugly, sometimes I'm art. What am I?

K

kayzeroshort https://puzzling.stackexchange.com/a/35973/18422

L

M (found by Bass)

N

NudgeNudge with this - "apple-beaten curious dog" has all its words in alphabetical order.

O

P (found by Gareth McCaughan)

PerpetualJ - An Odd New Technology

Q

QuantumTwinkie - https://puzzling.stackexchange.com/a/63998/18422

R (found by Gareth McCaughan)

S

T (found by TwoBitOperation)

TwoBitOperation - What is designed to go into holes and always has a hole in it?

U

V (found by El-Guest)

Volatility - Cryptic Poem: a study in what?

X (found by QuantumTwinkie)

Z (found by QuantumTwinkie)

zeethreepio - What is missing from this sequence of words?

• Might match mysterious Mister M?
– Bass
Jan 15 '19 at 17:35
• Ah, yes, I was thinking of them but couldn't fit the clue. Jan 15 '19 at 17:37
• 501 is DI... maybe J refers to this?
– Jafe
Jan 21 '19 at 8:51
• @OmegaKrypton Aaaa maybe it's this...?
– Jafe
Jan 22 '19 at 12:12
• @OmegaKrypton I've not come back to it in a week or so, searching through to find the answers is proving difficult. I've updated with jafe's suggestion and one more of my own. Feb 5 '19 at 12:08

I don't like making an answer as partial as this one, but OP specifically said partials are welcome and I might as well get the ball rolling.

I'm fairly sure that

we are looking for PSE posters and some of their puzzles. (This explains the otherwise puzzling remark about offending people.)

Specifically,

A is for the adventurous who approached the door

P plays with the periodic table with a poor professor

PerpetualJ: An Odd New Technology

R renders riddles with rations of word

Riley: My prefix is food, my suffix is rude (and of course the deluge of derived decompositions it led to)

Stealthy S should show off his small art with score 0

Possibly The Great "S"-caper with Mortin Myes' is at it again! 'HOW TO READ.' or stacksfiller with A puzzle in 140 characters and its double-sized sequel -- but I'm not sure why "with score 0" for either, so I may be missing something.

But

identifying all of these seems like a thankless task; I suspect I am missing some key point about exactly which users and which puzzles we are looking for. We definitely aren't looking for the highest-rated puzzle by a user with each starting letter (else Roland would have beaten out Riley), nor the highest-rated puzzle by each selected user (else Alconja would be represented by a different one), nor the most recent puzzle by each selected user (else Riley would be represented by a different one), nor the top-rated usre with each starting letter (else Rand would have beaten out Riley).

It's possible that

D is actually Deusovi Honeypot which is about Deusovi but posted by someone else, in which case my summary of what's going on above is a bit inexact. If that sort of thing is allowed then of course the task of identifying everyone and everything is even larger. In a similar vein, E seems like it might be about someone who posts only answers but no questions -- but right now the only notable PSE user I can think of who does that is, er, me, and none of my names begins with E.

• i'm an answerer and not an inquisitor (thus far), though I lack notability and the letter E! Jan 15 '19 at 18:15
• 3/4 correct for both answer and explanation! +1 Jan 15 '19 at 23:48
• @GarethMcCaughan are you not trying to do this anymore? :( Feb 8 '19 at 3:46
• I didn’t think you were the only one to not ask any questions, Gareth.... ;) Feb 9 '19 at 15:02
• @El-Guest wow! [scrolling through ancient questions of my own...] Mar 28 '19 at 15:53

The very most partial, but I think T might be:

Myself (TwoBitOperation). Specifically, this answer to:
What is designed to go into holes and always has a hole in it?

Which matches both given clues:
- finds a trench in a thread
- where can we find a hole in a thing with a hole in it?

• correct, nice job! @TwoBitOperation Feb 6 '19 at 0:46
• added new hints please check ;) Feb 8 '19 at 3:45
• Added a lot of hints, please check! Feb 9 '19 at 3:36

Edit: D seems to be

Deusovi, specifically, this puzzle..
Diamond, because he is a moderator, and maze due to this puzzle.

N might be

This user, NL628, though I’m not sure which puzzle yet.

W is

Will, to be specific, this answer- each country actually stood for two.

Even more partial than @TwoBitOperation, but I think Y is missing because

There are no puzzling.stackexchange users beginning with Y above 2000 reputation.

• Added a lot of hints, please check! Feb 9 '19 at 3:35
• so far: d and w correct, n incorrect. keep it up! Feb 9 '19 at 11:18

Partial
D

Deusovi,because he has a diamond by his name? Not sure of the puzzle though.

G

Glorfindel, he answers a puzzle were the answer had to do with going a round a running track. A walk of 3000 meters, but one foot has moved more, how so?

I?

Ian MacDonald, and possibly this post? What famous line does this Linux command line represent?

X

Xnor, and he answered a question were he had to say what the word was from the top view. Merlin and Hermes: Mysterious Lines.

Z

Zeethreepio and he answered this puzzle about Greek letters. What is missing from this sequence of words?.

• correct so far for all three of them! well done! Feb 6 '19 at 15:38
• i is wrong, keep it up! Feb 10 '19 at 4:52

If V is still missing, it could be for

Volatility, and this puzzle, one of many cryptics and enigmatic puzzles which seem to be their favourites.

A bigger stretch, but I could be for

Ivo Beckers, specifically with the diagram/illustration in this answer.

• the first one is correct, well done! Feb 9 '19 at 15:17
• Figured that the second one wouldn’t be, thanks though @OmegaKrypton! Feb 9 '19 at 15:18