Now, gonna talk about the corner xslash specific. It's universal, but harder on some characters and requires some finicky timing.
String in question is:
214B > dash 5C > delay 236CD > Xslash...
If done right, the dummy will turn back and get pushed towards you, allowing a follow-up combo.
Notes:
-It's important to dash in really deep, so Izanagi may sandwich them with EX Zio.
-Timing may vary on some characters, but the ideal is dash 5C as soon as they start falling from 214B
As I said, it's harder on some character but extremely easy on others. You *can* get it to work on the later, but we're talking about frame-perfect stuff.
Impossiburu: Yukiko
Don't even bother: Aigis, Labrys, Shadow Labrys, Akihiko, Mitsuru
Worth a try: Naoto, Elizabeth, Kanji, Teddie
Free, often works: Yu, Yosuke, Chie
And some combos off it:
214B > dash 5C > delay 236CD > Xslash > 2B > j.C > j.214A > 5A > 5B > 5C > s.jBB > B+D > Ziodyne (6047)
2A > 5B > 5DD > 214B > dash 5C > delay 236CD > Xslash > 2B > 5B > 5C > s.jBB > B+D > Ziodyne (4883)
5B > 5C > 214D > OMB > 5D > dash 2AB > 5DD > 5B > 214B > dash 5C > delay 236CD > Xslash > 2B > 5B > 5C > sj.BB > B+D > Ziodyne (7142)
5C > 214D > OMB > 5D > 2AB > 5DD > 214B > dash 5C > delay 236CD > Xslash > 2B >5C > j.214AB > 5B > j.C > j.214A > XSlash (9018)
They're all probably unoptimzed as hell, but.. whatever lol