There’s only Bison who shares the same inputs, but if you’re not literally physically handicapped, you can learn every character in that game in a couple of hours.
The whole fucking idea of the game is to be easy to pick up.
What people will be grinding training mode over are whiff punishing, frame traps, counter-hit and crush counter setups and finding buttons to deal with the right situations and not grinding out their combos, moves and super inputs.
Just pick something you like the gameplay and/or physical design of and you’re good.
The question is not if you’re a Guile player or not in terms of what you can learn easily in that game. The question is if you have ever played a fighting game at all. If you’re halfway competent in any Street Fighter or fighting game for that matter, you will be able to learn the basics of a character in a couple of hours. If you’re completely fresh meat it’s probably going to take a couple of weeks or month until you’re comfortable with the controls.