I'm unsure if this thread will get closed/deleted soon, but I'll offer my advice anyway, on a more general scale as opposed to the character-specific business on the matchup thread.
The faster characters in the game will depend on the fact that they can lock Doc down, and those who can do nasty **** out of L-cancel (Spacies especially) can really nail you when you try any shieldgrabbing. Thus, the answer is really to stay mobile at all costs. Work on your tech and your movement ALOT; that is running, dashdancing, wavelanding, davedashing, SHFFLing aerials on the fly. All of that will really help. Good hit-and-runs would be wavedash ---->jab, wavedash--->ftilt, wavedash---> dsmash, SHFFL'd nair and uair. Good attacks to waveland out of (whether your'e testing the opponent, or scoring a quick hit before you bounce) would be FJ pill and dair, whereas nair is doable but not always the most useful.
Also practice wavedashing out of shield so that people dont totally wreck you with shieldpressure and pin you to one place.
Hope that helps, good luck!