Sanae: My main. Throw 5C star at long distance, fly upwards and spam j2C stars when out of room to breathe, with advantage set up Suwako 214 Bubble and spam the hell out, punish stupid bullets with Kanako 623 rushdown or set the Wind Tunnel on advantage. Generally, fly around and confuse the enemy with moving the amulets with the wind or slide fast on the ground with it. Pressure is crappy, mostly delayed hits in hopes they won't block (stagger) or try my luck with 2A/6A. Cards are 3-card wave for easy counters and comboability, and 5-card wave / 4-card sky for power and comboability.
Suwako: At distance j6B ring throw and j6C stream spam FTW, on the ground send a 5C geyser and cancel into the 22 curse cloud for protection. For melee, j6A ring spin all the way to piss them off with the range, then j6B j6C airdash, repeat near wall. Go crazy with melee and j5B water when breaking guard. For cards 4-card clones and 2-card stream for relatively easy use. And 623 lazors are lovely for cover and trolling.
Reisen: Spam those 5B and 5C bullets, abuse 66A and j2A spin, beam them when away. For cards X-ray to make it easy to pin them with clones. Lunatic Red Eyes and Discarder are good too. Make use of j2A spinkick and make them eat 236C suppository explosion, as it deals a crapload of chip damage. I don't use her as much as the two above though.
Sakuya: Abuse fast 6C and 236 knives at long distance, piss them off when approaching with 5C bounce, 2B for anti-air, 66B stab for spellcards. Pressure the **** out of them with 6A, B bullets and j2A. For cards Killing Doll and timeslow when you master her pressure, Luminous Ricochet for easy comboability with dash attacks and Soul Sculpture for damn damage.
Those are my derpy ways of playing, so anyone with more of an idea, please correct '3'.