completed the game on 1/8 (Beginner) difficulty.
Completed with the ubiquitous Terry Bogard, K', and Ralf Jones (he wasn't much use, I didn't know any moves with him). I fought Adel in the end, and the end sequence is a bit disappointing - it obviously seems like the 'bad' ending. It seems you have to defeat Kusanagi with the finishing move being a Desperation Move, a Leader Desperation Move, or the first hit of a Tag Attack, to get the real ending.
completed the game with Terry, Yuri, and Gato on 1/8 (Beginner) difficulty.