Based on the "We Are ROCKMEN" cover, with the addition of Roll/Gigawoman
who's giving you the single-finger salute, Duo, and Bass who's impaled on one of Duo's shoulder spikes. Surprisingly for things I submit to Pixiv, it's done fairly well so far.
Why is Bass sulking like that? Because he's barely in the pic. That's what you get for...uh, RADIX running out of space.