Most are my own screencaps. 3-D models with flat gray backgrounds are rips made by Renmiri for the FFXProject's Wiki, and some blitzball players are from Finalcraft's gallery. Other good screencaps come from Blue Laguna's cutscenes/FMVs archive, Final Fantasy World, Cyconmaster's PCSX2 screencaps, and Shatterheart's X and X-2 galleries.
I still need help getting better screencaps of a few, as you can see, so if you have one to share, please let me know at katran at cox dot net!
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 AB woman in red (Linna)
|  AB man in red vest
|  Chocobo agent
|  Bikini woman (Naida)
|  Chunky guy in green
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 Al Bhed kid
|  Airship engineer
|  Gas mask (Nedus)
|  Spiked hair (Keyakku)
|  Al Bhed in brown vest
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 Al Bhed in blue cap (Ropp) |  |  |  |  | 
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Need better screencap for: Guy in khaki (third row, right) -- found in Luca bar
Old Man (Gramps) |  Old Woman |  Girl with doggie |  Merchant | 
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 Fisherman (Daddy, Tatts) |  Woman in blue (Vilucha) |  Boy w/green headband (Son) |  Woman in purple |  Girl in red shorts (Yuna's friend)
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 |  Man in shorts (Young weaver) |  Man in blue and yellow (Old weaver) |  Portly Crusader |  Short Priest
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 Main Priest (Mep) |  Priestess |  Old Priest |  Woman in green skirt (Calli's mom) |  Woman in orange tunic (Wantz's sis)
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 Man in green and white ("Spoony bard")
|  Woman in white |  Woman in white |  Man in purple shirt (Fabric seller) |  Kid in
dark red |
Need better screencap for: Kid in dark red
 Ship captain
|  Sailor in blue (Zalitz) |  Female sailor (Kiryuu) |  Helmsman |  Sailor in blue cap
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 Pom-pom lady (Shaami)
|  Cameraman
|  Guard in blue (Biggs)
|  Guard in brown (Wedge)
|  Guard in gray
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Need better screencap for: guard in gray
 Woman in tan and orange
|  Man in green and yellow (Jumal)
|  Man in green and brown
|  Man in gold tunic
|  Man in green and purple
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 Man in blue vest
|  Man in white and blue
|  Woman in red and blue (Shuu)
|  Woman in smock
|  Vendor in pink
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 Beaky guy in purple
|  Beaky guy in red
|  Girl in rust skirt (Calli)
|  Woman in green (Mifurey)
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 Old woman in brown
|  Little nun
|  Portly guy in blue vest
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Need screencaps or better screencaps for: Old woman in brown, portly guy in blue vest, little nun
 Crusader in gray
|  Crusader in purple and green
|  Crusader in purple and white (Gate Captain)
|  Crusader in need of pants
|  Crusader in green
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 Crusader red/white/blue (Kyou, Yojimbo, Beclem)
|  Crusader in red (Miyu)
|  Crusader in green and purple |  Crusader in yellow and green |  Junior Crusader
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 Junior Crusader |  Crusader in blue |  Crusader in yellow and rust
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 Shoopuf driver |  Macalania Nun |  Macalania Monk |  Chocobo rider |  Monster Arena Coot
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Need screencaps or better screencaps for: Monk in tan and brown, Macalania priest, Svanda, guy in brown overcoat, monk in green and orange with purple cap
 |  |  | Female Ronso
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 |  |  | Male Ronso |
 |  | Biran, Yenke
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 Lord Jyscal |  Tromell
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Need screencap for: stooped old Guado woman in brown, house of Fusty Elders
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 The Aurochs
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 Datto | < Jassu |  Letty |  Botta |  Keepa
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 Bickson |  Graav |  Doram |  Balgerda |  Raudy |  Abus
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 Berrik |  Blappa |  Eigarr | |||
 Vuroja |  Larbeight |  Nizarut |  Kukulan |  Deim |  Isken
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 Irga Ronso |  Nuvy Ronso |  Gazna Ronso (male players all look the same)
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 Noy Guado |  Pah Guado |  Zazi Guado |  Auda, Yuma Guado |  Nav Guado |  Giera Guado
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Need screencaps or better screencaps for: Balgerda (above is probably Doram; Balgerda is darker-haired), Raudy, Abus, Judda, Nimrook, Nizarut, Isken, Deim, Kulukan, the male Ronso, Irga Ronso (pigtail), all Guado blitzers
 Gatta
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Luzzu
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 Barthello
|  Dona |  | 
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 |  |  O'aka XXIII  Wantz
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 Shelinda | 
|  Maechen | 
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 Elma |  Lucil |  Clasko |
 Isaaru |  Maroda |  Pacce |  Father Zuke
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 |  Lady Belgemine |  |  Lady Ginnem
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 Brother |  Cid |  Mr. Rin | ||
 Kinoc |  Mika |  Kelk |
 Yunalesca | ||