I hope this is okay. These were the ones that came straight to mind so there are probably some you already know.
Ryu, Evil Ryu, Ken and Akuma:
crouching / standing Jab-> standing Strong
crouching / standing Jab-> crouching Fierce
crouching Short-> standing Strong / crouching Fierce
standing Roundhouse-> crouching Forward*
standing Roundhouse-> Shinkuu Hadouken*
standing Roundhouse-> CC crouching Roundhouse*
crouching Strong-> crouching Short / crouching Forward
crouching Strong-> CC**
standing Roundhouse-> CC**
- = Ryu only
** = Evil Ryu only
Chun Li:
crouching Strong x 2
crouching Strong-> crouching Short
Sagat:
crouching Fierce-> crouching Short (large crouching characters only)
Adon:
crouching Jab-> crouching Strong
(meaty?) crouching Strong x 2
Charlie:
crouching / standing Jab-> standing Strong
(corner) standing Strong-> Jab Sonic Boom-> crouching Forward / CC crouching Roundhouse
Birdie:
meaty standing Roundhouse-> crouching Fierce / crouching Forward (opponent must be crouching)
Sodom:
standing Strong-> crouching Fierce / crouching Short
Rose:
crouching Jab-> crouching Strong / crouching Fierce
crouching Strong-> Soul Illlusion-> Level 2 Aura Soul Spark
crouching Strong-> Soul Illusion-> crouching Short / crouching Roundhouse / CC crouching Roundhouse
Alpha Counter-> crouching Strong / Standing Fierce
M.Bison:
crouching Forward-> standing Roundhouse (1st hit)
Sakura:
meaty Flower Kick-> crouching Short
Guy:
crouching Jab-> standing Strong
Rolento:
standing Jab x 1~2-> crouching Forward
Gen:
slappy hands-> Level 3 Zan’ei
Dan:
Crouching Jab-> standing Strong / crouching Fierce
Dhalsim:
crouching away Strong-> crouching Strong / crouching away Forward / crouching away Short
trade with Level 1 Yoga Inferno-> crouching away Short / CC crouching away Roundhouse