N-Tactix

As promised, let's start off with Red Earth:

-Leo was modelled after the tokusatsu superhero, The Extraordinary Lion-Knight (快傑ライオン丸/Kaiketsu Lion-Maru), a Lion Knight who battles against evil across the Sengoku (warring states) period of Japan. Just like Leo, he could even change the element his sword emitted, eg fire, and its properties to suit him at any given situation. 

-The man you have to thank for writing the stories of SFA+SF3, Darkstalkers, CVS' dialogue and Resident Evil's stories of the 2000's is a man named Haruo Murata. He envisioned Alpha originally as being a alternate universe from the SF2+3 world and originally had wanted to see Charlie as not the same man that Guile was friends with, as a result this was why he gave Charlie a happy ending in Alpha 3. He also didn't want to give character specific birthdays and too much backstory for the Alpha games in comparison to Darkstalkers because in his words:

"I want the player to imagine and create the world freely on their own terms, so I stopped making such an intrusive setting." 

-He also had doubts in whether he should have included Guile to replace Charlie in Alpha 3's base roster saying "At first, I was very careful about how to include Guile into the setting, so I was told that if I put out Guile in Alpha 3, I would break the story completely". Ultimately, he wrote Guile's story as him chasing Charlie for most of it so that it wouldn't conflict with Charlie's own story except for the ending being different between the two. 

-In addition, he envisioned the Alpha series as being a sort of dream match where the players would muse on the battle they'd have as  "maybe this might have occurred in the past"  and that the worldview wasn't supposed to be cohesive, only from the perspective of the player character. 

-The staff in SF3 already had a image of what Sakura would have gotten up to during the events of the game, being  "active as an member of society, running around with a mobile phone in one hand, whilst wearing a business suit alongside a headband and gloves in both hands" according to an interview in Gamest Guide volume 77

-Cammy already having a name in Alpha 3 contradicts the original backstory she had in SF2. On a stormy night, she was found caught

in a mudslide that had occurred beside a special operations unit of the British Intelligence Department and was protected at the base. She had lost her memory and so had no knowledge of her identity but she was nicknamed "Cammy" from the letters "CAMM-740106" on the pendant tying up her belongings. She had shocked those at the base by somehow being able to make a full recovery of her wounds within one week.