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The Flash #52 (2018) opens with the panel below (minor spoilers for the Flash War arc). This "council of Flashes" seems to feature the Flashes of different universes.

And a different angle right after, revealing even more Flashes.

Who are all these Flashes?

Overview

First, let's look at an overview image of the two comic strip pages, with labels, just to appreciate how much there is to identify. Then we'll go through each section of the images in detail.

Details of first image

First, the Flashes that appear in real big, seen from the back.

• 0k: Johnny Quick from Earth 3? Goggles and goblin-shaped head don't match, but the hinged shoulders and general look is reminiscent of the guy.

• 0l: Speed Freak of Earth 47, from Animal Man #23 (1990). Spiky hair, yellow costume with diagonal red pattern, red lightning bolts "ears". Same as 4p.

• 0m: Flash of Earth 42, from The Multiversity #2 (2015)? Same as 4o, but from back here.

• 0n: Lia Nelson of Earth 9, from Tangent Comics: The Flash (1997). Blondie, purple outfit with a cape and a spikey symbol on the chest. Same as 4j, 4n.

• 0o:


• 0p: same as 4l, but profile view.

Next, the four characters at the center of the podium:

• 0q: Fastback, the reptilian rocket, of Earth 26, from Captain Carrot and his amazing Zoo Crew! #1 (1983) - thanks to RDFozz for pinpointing an earlier depiction of that one! Same as 6a, 7c

• 0r: The Accelerated Man of Earth 19, from The Multiversity Guidebook (2015). Headscarf, goggles, white face mask, yellow gloves. Same as 6z, 7b

• 0s: Johnny Thunder of Earth-18, from The Multiversity #2 (2015)? He doesn't have a headscarf but that's the only cowboy Flash I know... Same as 6c, 7a.

• 0t: Barry Allen of Prime Earth, the current main continuity. Same as 6b, 7d.

First three bottom panels

• 4a:


• 4b: Flash of Earth 22, from Kingdom come (1995). All red, blurry, a lightning bolt around him, helmet. Same as 2k.

• 4c: Accelerator of Earth 39, from The Multiversity Guidebook (2015). Grey costume, right-pointing orange arrow. Same as 6u, and possibly 1c.

• 4d:


• 4e:


• 4f: Same as 1a?


• 4g: Danica Williams of Earth 12, from Batman Beyond Unlimited (2010). Yellow-tainted goggles, spiky black hair, yellow lighting bolt on black disk, yellow wristbands, black gloves. Same as 1b.

• 4h:


• 4i: Bizarro Flash of Earth 29, from All Star Superman (2007). Same "chain" pattern around the lightning bolt symbol, electricity coming out of his ears, yellow gloves. Same as 1f, 6w.

Last three bottom panels

• 4j: Lia Nelson of Earth 9, from Tangent Comics: The Flash (1997). Blondie, purple outfit with a cape and a spikey symbol on the chest. Same as 0n, 4n.

• 4k:


• 4l: There is a Mercury Flash (6x, 1g), but they don't look the same that at all...


• 4m:


• 4n: Lia Nelson (see 4j, 0n)


• 4o: Flash of Earth 42, from The Multiversity #2 (2015)? We only saw Steel, Batman and Wonder Woman from this Earth, but it's the same child-looking, chibi-style art... Same as 0m.

• 4p:

Let's take a detailed look at the bottom left podium on the big panel

There are some characters here that appear as just part of an outline with no details, and are probably impossible to identify (but if you can identify them, do add the answer). These get the labels 5a–m, which don't appear in the overview image.

• 0e:


• 0f:


• 0g:


• 0h:


• 0i:


• 0j:


• 1a: Same as 4f?


• 1b: Danica Williams of Earth 12, from Batman Beyond Unlimited (2010), same as 4g.


• 1c: Accelerator of Earth 39; see 4c, 6u.


• 1d:


• 1e:


• 1f: Probably Bizarro Flash of Earth 29, from All Star Superman (2007), same as 4i, 6w.


• 1g: Mercury Flash of Earth 44, the same as 6x.


• 1h:


• 1i: Red Racer of Earth 36, from The Multiversity Guidebook (2015). Same as 6y.

Now the few characters on the top left

• 0a: Blitzen of Earth 10, from The Multiversity: Mastermen (2015)? Nazi-looking helmet fits, but not the blue pants or the "ruffed" boots and gloves...

• 0b: Unnamed Flash of Earth 30, from The Multiversity Guidebook (2015). Suit is red on the front, black on the back, kneepads, yellow boots with straps, yellow gloves, bike-like helmet

• 0c:


• 0d:

The left part of the bottom podium on the top right

• 2a:


• 2b:


• 2c:


• 2d:


• 2e:


• 2f:


• 2g:


• 2h:


• 2i:


• 2j:

The right part of the bottom podium on the top right

• 2k: Flash of Earth 22, from Kingdom come (1995). Same as 4b.


• 2l:


• 2m:


• 2n:


• 2o:


• 2p:


• 2q:


• 2r: Aquaflash of Earth 32, from The Multiversity Guidebook (2015). No explanation needed. Scales!
  

• 2s:


• 2t:


• 2u: Blood Flash of Earth 43, from The Multiversity Guidebook (2015)? The picture's pretty blurry but this guy's mouth seems odd. Earth 43 is populated by vampires, including a vampire Flash

• 2v: Mary Maxwell of Earth 6, from Just Imagine Stan Lee with Kevin Maguire creating the Flash (2001). White suit, knee pads, ribbon-like headdress

• 2w: this purple/white costume is a bit reminiscent of Marvel's speedster Quicksilver in the 2018 Quicksilver: No Surrender series (picture)


• 2x:


• 2y:

Finally the top podium on the top right

• 3a:


• 3b:


• 3c: This costume is reminiscent of Robin's old one back in the 50s-60s?


• 3d:


• 3e:


• 3f:


• 3g:


• 3h:


• 3i:


• 3j:


• 3k:


• 3l:

Details of the second image

Foreground of top panel

• 6a: Fastback, the reptilian rocket, of Earth 26 (1983). Same as 0q, 7c


• 6b: Barry Allen of Prime Earth. Same as 7d, 0t.


• 6c: Johnny Thunder of Earth-18, from The Multiversity #2 (2015)? Same as 0s, 7a.


• 6z: The Accelerated Man of Earth 19, from The Multiversity Guidebook (2015). Headscarf, goggles, white face mask, yellow gloves. Same as 0r, 7b.

Then the bottom panel

• 7a: Johnny Thunder of Earth-18, from The Multiversity #2 (2015)? Same as 0s, 6c.


• 7b: The Accelerated Man of Earth 19, from The Multiversity Guidebook (2015). Headscarf, goggles, white face mask, yellow gloves. Same as 0r, 6z


• 7c: Fastback, the reptilian rocket, of Earth 26 (1983). Same as 0q, 6b.


• 7d: Barry Allen of Prime Earth. Same as 6b, 0t.

The podiums in the background of the top panel

Again we can see a lot of bare outlines in the back of the crowd that I haven't yet labeled, but if you can identify any, please mention it.

• 6d:


• 6e:


• 6f:


• 6g:


• 6h:


• 6r:


• 6s:


• 6t:



• 6u: Accelerator of Earth 39, from The Multiversity Guidebook (2015). Same as 4c, possibly 1c.




• 6v:



• 6w: Bizarro Flash of Earth 29, from All Star Superman (2007). Same as 4i, 1f.


• 6x: Mercury Flash of Earth 44, from The Multiversity Guidebook (2015). Elongated face, backwards-rotated yellow lightning bolt on white disk. Same as 1g.

• 6y: Red Racer of Earth 36, from The Multiversity Guidebook (2015). Same as 1i.

6a, 7a, and 0s are not Johnny Thunder but Wally West from the original Justice Riders Else world.