From Astral Home(main menu) go to Offline Play.
Select "Quick Battle."
There will be four names and titles and ranks displayed at the bottom. (You can press Y to search for different fighters).
These are custom-created fighters from the developers.
I suggest fighting lower ranks. Such as E's or D's. C's aren't too bad either.
Each win gives you a different title. After your tenth victory, equip the title you won from that fight via Astral Home.