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50. Seth: The main antagonist of Street Fighter IV, Seth is an enhanced being bent on controlling the remains of Shadaloo after M. Bison's death. He imitates the styles of many other fighters, and thus has an odd mash-up of several different styles and fighters, including the Hadoken and Sonic Boom. As an actual villain, though, Seth is lackluster, unable to muster the same iconic evil that Bison does, and as a boss is just a typical "super fighter." His eventual betrayal by his supposed subordinate Juri and destruction is more cathartic than anything, and it's unlikely we'll see him again despite his occasional appearance in competitive Street Fighter IV.
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49. Dee Jay: As the only character designed by someone from Capcom's American arm, Dee Jay is one of the most reviled characters in the series' whole canon. He's among the least sensitive stereotypes in the Street Fighter II cast, and it's easy to see him as the point where the Street Fighter II was going off the rails with re-releases. But the character's grown on me, and since we see so little of him all around, he's become a nice surprise. And considering how rare black characters are in the series, I'll take what I can get.
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48. Ingrid: A mysterious young girl who wields what she calls "true Psycho Power," Ingrid was introduced in Capcom Fighting Evolution before making her Street Fighter debut in Alpha 3 MAX. One of the first characters to have arcing projectiles and using a unique, ballet-esque fighting style, Ingrid became a popular pick for crossovers and appeared in many of them, despite never being in another Street Fighter game after Alpha. Series producer Yoshinoro Ono has said that Ingrid might make a reappearance in V, and given the timeline and setting of the game it would certainly make sense. For now, Ingrid is a mysterious outlier, but time might tell if she becomes a bigger player in the Street Fighter universe.
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47. D. Dark: Doctrine Dark stands out as one of the few times Street Fighter ever acknowledged the presence of its biggest rival worldwide, Mortal Kombat. Ken was rumored to be in Mortal Kombat: Deception, but that was actually placeholder name for the character Kobra. Street Fighter vs. Mortal Kombat has never materialized. So seeing a character so similar to Scorpion in a Street Fighter game (he throws out a wire that behaves much the same way as Scorpion's spear and his unit's emblem is a scorpion) made you think about all the possibilities that might eventually occur. They never did, but at least we got one of the best new characters from the EX games as a consolation prize.
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46. Abel: A tough grappler who employs Russian wrestling and MMA techniques, Abel is one of many fighters in Street Fighter IV heavily influenced by newer fighting styles rather than traditional martial arts. Abel is an amnesiac in Street Fighter IV after being captured and used to make the first round of dolls for Bison, but quickly regains his memories and goes on a vendetta against Shadaloo. Capable of grappling with the best of them, his mix-ups and throws more than make up for his lack of projectiles, though it can hurt him against fighters like Ryu who can easily employ zoning against him. Once Abel gets close, though, he can be quite dangerous and difficult to slip away from.