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60. Lee: One of the many non-playable fighters in the first Street Fighter, Lee ends up having larger implications in the series by becoming the mentor of Yun and Yang. His fighting style is highly reminiscent of them, and his dashing punch later became a staple move of Yun and Yang fighters everywhere. Many fighters, including Chun-Li, honor him as a master throughout the series after his implied passing. It's not often a random NPC becomes a key player, but Lee and his dashing punch was just awesome enough to do so.
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59. Guy : I've never had a huge affinity for Guy (he always seemed like too dour a foil for Cody in Final Fight), but I have to admit he's got a unique fighting style. As the series' most prominent ninja (sorry, Maki), Guy's incredibly hard to catch, and his fighting style can overwhelm you with pressure as he throws you across the rooms and quickly dashes right beside you. He doesn't fall into the typical "rushdown" style of mixups either, making it hard to guess what he's about to do next. Fitting for a ninja.
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58. Cracker Jack: Based on Daisuke from the infamous manga series Lupin III, Cracker Jack certainly has some style. Making his only appearance in the EX series of Street Fighter games, he's a tough Vegas bouncer who wields a bat and plays bodyguard for Blair Dame. Besides the style, though, he mostly just imitates moves from main series regular Balrog, and didn't make the jump from EX to the main series.
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57. Decapre: Decapre is the third Cammy clone the series introduced, which is a huge knock against her. But Capcom managed to make her so different from her inspiration that you can't consider her a rush job. Her moveset is completely different from Cammy's, uses different inputs, and forces her to play in a style very unlike the other dolls. It's actually kind of astounding how much they got out of using the same model they did for Cammy, except with a metal mask and magic hand blades. It makes you wish they'd come up with a completely different concept and backstory for the character, honestly.
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56. Sean: The little brother of Laura Matsuda, Sean seeks to become a fighter in the world arena. Unlike his big sister, though, Sean imitates the shoto style of Ryu and Ken, constantly seeking to be trained by the latter. Sean is first introduced in The New Generation series and managed to fluctuate between being one of the best characters in 2nd Impact to being a joke character in 3rd Strike, and was originally supposed to be the only shoto character in Street Fighter III until it was decided that Ryu and Ken were too popular to not include. So, Sean ends up in the shadow of everyone again, not popular enough to carry the shoto style and not established enough to be his own character.
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55. El Fuerte: Let's be fair: El Fuerte is a better representation of Mexican culture than T.Hawk, who you could mistake for Native American rather than a Mexican one (the line is kind of blurry, to be honest). He does a great job of representing the full bombast of Lucha Libre, fooling you into thinking his substance is style. What holds him back is that he's kind of annoying to play against, and more often than not it takes way more effort to score a win as him than with other characters. So he's unfortunately kind of a dud. But he gets an A for effort.
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54. Gouken: The master of Ryu and Ken, adoptive father to the former and older brother to Akuma, Gouken plays master to some of the series' biggest hitters. Despite his importance, he only appears as a playable fighter in Super Street Fighter IV, as both a fighter and boss character. His fighting style is a toned-down, less violent version of the Hado called Chikara no Hado. Gouken doesn't have as many options for anti-air or control as the others, but focuses more on reading opponent's moves and countering them effectively. He can be an extremely punishing character, but still falls into the crowded shoto category and fails to be a more memorable fighter because of it.
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53. Yang : I'm not sure why Capcom thought we needed two brats who think they're too cool for school and ride around on items from a skate shop, but Yang is definitely the lesser one in almost every way. His hair is goofier, his attacks aren't as cool, and skateboards are definitely better than rollerblades. It's kind of unfortunate that Yun kind of overshadows Yang in every way imaginable (in aesthetics, charm and prominence in the competitive crowd), but it goes to show just how unnecessary he is. Whenever you see Yang, there's Yun, but it's not always the other way around (see Street Fighter Alpha 3, for starters). He's like the Waluigi of Street Fighter: the less popular one of a duo that's less popular than another duo (Ken and Ryu).
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52. Necro: A stretchy, deathly pale combatant, Necro uses his flexible limbs to strike foes from afar and then shock them by running electrical current through his body. Obviously taking cues from both Dhalsim and Blanka, Necro was nonetheless an interesting addition to Street Fighter III. He hasn't had much in new games apart from a cameo appearance in V, but could easily be someone to look out for in future additions to V, as his interesting background as a G-Project member and unique fighting style.
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51. Fei Long: As one of the earlier examples of Bruceploitation in fighting games, Fei Long's entire character basis is kind of dated now (I would also say Tekken's Marshall Law is a better imitator, but that's just me). But in a sea of basic stereotypes, Fei actually stood out in Street Fighter II as a character who didn't just tap into the most shallow parts of a country's culture. He rewards patience and is more about exploiting gaps in your opponent's offense than building your own—something I'm sure Lee would endorse, but that doesn't make the character any less boring to play.