xiayou can be played in a myriad of styles, but she excels at close-range where she can be extremely evasive, mobile, and generally safe. AoP is her signature stance because it ducks under highs, some mids, and even some lows. it also has a built in minor sidestep right(?). moves like d/f+1, D/F+1, 4~3, 1>d+2, ff+3, ws+2, magic 4, ss+4, and AoP mixups, are just a few things to get you started. iirc, all backturned low jabs actually hit low instead of normal low jabs which hit special mid (moves that can be blocked low or mid), so considering xiayou can get into BT very easily with RDS (rain dance stance) and moves that transition into it, gives her more frequent access to that very quick low poke.
king’s moves generally are slow to execute and will tend to get beat out up-close from faster characters, but he has tools to help him in those situations.
backdash for starters will help you with creating space.
d+1~2 is one of kings main anti-pressure moves and is also a high crush.
b+1 is a great move to CH fish with as its relatively fast, and will produce an unescapable stun on CH. its only -6(?) on block but its high (which is irrelevant when its applied properly).
u/f+4 hopknee. space it properly.
d,d/f+2. use it.
d/f+2,1 CH fishing. not the greatest, but you’ll get a pretty good reward if it hits. second hit is high and will be ducked if your opponent recognizes it.
kings magic 4, while not being as fast as other characters magic 4’s, is still good to throw out every now and again to get a CH juggle.
d/b+3 is a decent crush and will pass right under highs and some mids, but it suffers from a little bit of slowness. fortunately, it’s a juggle starter on CH.
ws+4. good generic ws+4.
f+3 is a decent mid to fish with at close range because you can input the just-frame throw followup for it (1+2) on block. if it hits, they get slammed, if they block, king is only at -9(?). (note: not to sure about this moves CH properties in ttt2, will need to test).
f+1+4 chest bump.
king has a strong attack reversal (AR) game because none of his reversals can be reversed/chickened (ARR). he can reverse ALL kicks, and ALL right punches only. so no left punch attacks, and no elbow or knee attacks.
there’s some other stuff that i wouldn’t recommend like cd chain throws, rock bottom, black shoulder, ss+2, d,d/f+1, ssl+u/b+1, b+4 (scrubby kings use this alot), CH ali kick>mid smash, some others, but you can use those moves sparingly.