using reptile, when you are far sweep distance: throw slow force ball (opponent blocks), fast force ball (opponent jumps over), roundhouse person in the air the immediately throw another slow force ball of which they will get hit by, then combo or uppercut depending on your preference, repeat. It's easy once you see it in practice.
Kung Lao - early jp -> div kick,fall next to the cpu -> Spin
Scorpion/Hsmoke - Air Throws
Sektor/Rsmoke - Jump Back with late kick -> Teleport
Sonya - Just JK
Kano/Jax - Sweep and if they jump -> Air Throw
Ermac - aaSUJK strat into TKS....
and there are other various strats with the rest of the crew but those are the easiest...
You can abuse Sindels scream pretty good against the AI in UMK3.
When they run into you, you can always catch them with the scream.
If they dont run into you but just wait, use her Air Fireball unti they move.
After you catch them with the scream, you can make a combo and scream them again when they stand up, you just have to be outside of footsweeper range, then the will always get catched by because the scream override there missile attemp.