the best TAS character would be the character with the best frame data, regardless if you think someone would be good or not, if you properly space(you will if it's TAS)/have faster moves. you're going to beat out every character. not saying it's going to look pretty. then theres also looking at perfect shielding, and what that would do. airdodging exact frames, you can't look at just one character, you have to look at both characters that are fighting. if one character has an attack that has frame advantage over the other, that outspaces the other, and is safe even on perfect shield, then TAS that character would win in every situation if the attack covers enough. and if the opponent has to attack from the air, they better have anything thats safe on perfect shield, because if they don't they'll never be able to beat the other character.