Esfournine

It's still hidden, you need that old team to get to them. Kind of like KoF '99 for ps1, where you unlock stuff like that, mmm...those were fun.

There is another one for the "Old England Team" with Mai, Yuri and King.

Well, it's pretty obvious, Kyo is a biker guy, no? Add a helmet. Who else would be in a picture with Benimaru and Daimon? (Besides possibly Shingo). And just look at him :\...They also have artwork of Kyo in a jacket sort of like that, except it's brown.

And Kyo of course. You get that picture if you beat Mukai as that team, just wait for the credits to finish.