[BarbaraGordon]

Last night, I tallied the number of figures that certain characters have had. Although we joke about the Trinity getting too much attention, Joker is right up there. Harley Quinn is the surprising laggard.

For Batman, I did not count the figures that aren't Bruce Wayne or Batmans from alternate worlds/universes. If you include those, the number easily climbs up to 40 or higher.

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Number of figures per character (not counting alternate heads/re-paints/variants or megafigs)
(As of February 26, 2022)

Bruce Wayne (Batman): 24
Joker: 8 + 1 from Mortal Kombat (but minus 1 if you don't count New 52 Death of the Family Joker, which is really similar to The Clown Joker)
Clark Kent (Superman): 9
Diana of Themyscira (Wonder Woman): 6
Barry Allen (Flash): 5
Jason Todd (Red Hood): 4
Barbara Gordon (Batgirl): 3
Harley Quinn: 3
Dick Grayson (Nightwing): 2
Damian Wayne (Robin): 2
Oliver Queen (Green Arrow): 2
John Stewart Green Lantern: 2

Lex Luthor: 1.5 (the green and blue suits are very similar, though the blue suit also has a very large chair that's a pretty unique accessory)
Reverse Flash: 1.5 (the Rebirth design is basically a re-paint of Rebirth Flash)

Note: Several of Superman's bodies were used for multiple related characters, such as Red Son and Bizarro.