The Japanese LCCs are the worst, as they simply do not make any sense.
Japanese are supposedly punctual. Their LCCs are not.
Japanese are polite. When asking how I get through security in-time the Peach agent at KIX practically sneered at me (she was Japanese)-actually JinAir was calling for their passengers to expedite their immigration process.
Japanese follow rules-I have been asked for an onward ticket flying into Japan on NH but Vanilla did not. They did follow the strict 7kg carryon restriction even though I had purchased baggage (one backpack but heavy cause of camera and laptop, 10kg).
Japanese like comfort and avoiding hassle-Vanilla does not allow online checkin for international flights due to passport and visa checks (somehow millions of other airlines do not have this issue), you get to sit in a bus waiting to go in the plane, somehow deplaning is slower than normal in Japan even though nobody has large bags over 7kg. I guess it is a different clientele that ships luggage to the airport than the one that flies LCCs?

But I guess as long as there is not much competition the Japanese LCCs will survive.