Gonna put some answers in the spoilers.
answers
[details=Spoiler]1. 5, which would be Short, Forward, Roundhouse, Start, and Hold.
2. 3, which would be Lariat, Hawk Dive, and both versions of Boxer’s TAP.
3. Chun-Li, amd Chun-Li only,
4. It can grab opponents on the ground and in the air.
6. Angels, Birds, Starts, Devils
8. Ryu, Honda, Blanka, and Guile.
13. Only one I know is that Ryu’s air hurricane kick did not go horizontal in the air anymore.
18. CPU Akuma throws 2 air fireballs at a time, while player Akuma throws 1.
19. One, that replaced the original color costume.
20. 7 characters. Blanka, DJ, Guile, Sagat, Claw, Dictator, Boxer, and Dhalsim.
22. Dhalsim’s super, because it can not be used as a reversal.
23. Ryu, Dhalsim, Dictator, Fei, Blanka (dunno if it counts as fire) and Ken.
25. DP motion and charge b, f motion
26. Chun-Li’s super, with 6 hits.
27. Zangief and T. Hawk’s super, with one hit. If not the grabs, E. Honda’s, with 2 hits.
28. There are actually 3 that cannot be whiffed, and they are Zangief’s, T. Hawk’s, and Claw’s.
30. 3 or 5 hits.
31. Ryu and Fei Long. Ryu with j. strong and f+strong, and Fei Long with chicken wing and f+forward.
32. Old characters.
33. DJ, Chun, and Dictator. DJ with super to RH upkicks and forward upkicks to forward upkicks, Chun with super to RH upkicks, and Dictator with super to j. strong x2.
35. Ryu, Dictator, Sagat, Cammy, Hawk, Guile[/details]