This thread makes me happy I am not that great at fighting games but I play a lot of them, I dont have a lot of time to game anymore but odds are if I am playing I am playing a fighting game. I am just going to list my favourites from different games and expand on a few of my all time favs :-
Clayfighter (SNES) - Bad Mr Frosty, The Blob
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Killer Instinct - Spinal, Fulgore, Raptor
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Street Fighter series - Blanka
[this is the character that got me into fighting games whys that you may have asked (although probably didnt) well he just looked awesome to my 10 year old self and since his moves were all charge or mash buttons I could actually do his specials unlike say Ryu who took me ages to figure out how to do a shoryuken. These days it seems stupid but back then all I had was a picture of a pad with a z direction input on it.]
Chunli, Ryu, Makoto
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KoF series - Mai Shiranui, Vice, Chang Koehan
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Mortal Kombat series - Scorpion, Kitana
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Blazblue series - Hakumen, Makoto Nanaya [absolutely friggin love this character from her design down to her moves and personality, I absolutely suck at Blazblue and I am much better with Iron Tager than Makoto but she is just so much fun to play as win or lose I really dont care]
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Soul Calibur series - Cervantes, Tira, Siegfried [one of the few characters I ever got proficient with especially in the original SC and SC 2 (even though he was Nightmare there) as such I have grown to like him a lot he just feels comfortable and I can get him to do what I want most of the time]
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Tekken series - Roger, Michelle, Asuka, King
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Dead or Alive series - Ayane [again this is one of the characters I just love to play as I love her design and moveset as well as her personality spinning has never been so much fun, its not so good online as DOA netcode is ass (and its not the only series to be bad online) but offline she is just great fun to play as]
Bayman
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Skullgirls - Valentine, Peacock
MVC series - Psylocke [this may be cheating but Psylocke is my favourite marvel character by far so when she is in a game I almost always pick her regardless of whether she is good or not or works well in the team]
Rogue, Storm, Amaterasu
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Guilty Gear - Ino, Faust [Love this guy I cant play him to save my life but his character is just awesome]
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Persona 4 Arena - Chie [My favourite character in the RPG and by extension this game as well]
Mitsuru, Teddy
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Dissidia - Tifa [one of my favourite characters of all time (although I initially hated her)]
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Top 5 in no order:-
Tifa Lockheart
Blanka
Makoto Nanaya
Psylocke
Ayane
Top 5 Excluding characters that didnt originate in Fighting games (again no order):-
Blanka
Makoto Nanaya
Ayane
Siegfried
Mai Shiranui
Damn that was tough so many good characters to choose from and I missed out some games as well oh well never mind time to go online and get beaten up.