What system uses a b and c

BlazBlue (not Cross Tag) is one. You have A, B & C for basic attacks, and D to activate Drive. Marvel vs. Capcom Infinite as well. It didn’t call them “A, B, C” and so forth, but Skullgirls has a whopping 6 buttons to use for regular atacks.

I should of specified I meant console

Most fighting games don’t have fixed layouts. The input “A” isn’t necessarily always the button “A”. This creates a problem when talking about how to execute moves. For example, the “Drive” button on BlazBlue is assigned to RT by default. Let’s say I play BlazBlue after Skullgirls, though, where RT is a heavy kick. Well, okay, I’ll reassign “Drive” to “A”. But, now when the game’s trying to show me how to use Rachel’s wind, it’ll show me the input “RT” under basic controls. So, rather than always putting in a disclaimer saying “(default controls)” on everything, they instead had the annotation for Drive be “D” no matter what button “D” as actually assigned to. This is really helpful, because fighting game default controls are as different from one to the other as apples and steaks. Yeah, not even apples and oranges. At least you can call those both fruit!