Under Night In Birth, the most recent Blazblue release, the most recent Guilty Gear release, the most recent Persona 4 Arena release. Basically any recent 2d "air dash" fighting game. We have Skullgirls but that is more like Marvel Vs. Capcom (also isn't a Japanese developed game).
This genre of fighting games has virtually 0 presence on PC other than emulation of old games. There are old versions from before like the first Blazblue, very old Guilty Gears and Melty Blood but they either have no online or only peer2peer online where you need the other person's IP address. I really do think there is a huge opportunity to port these games to PC and Steam specifically as people do want them. Someone just has to take the bite. It probably won't be Arc System Works though considering how little faith they have in PC gaming demand and the only bones they are throwing on Steam to judge demand are the 10 year old PC games that no one will buy.