Is this guy in...

[Tom]

 Crest of the Wolf / Riot Zone ?



 He's "in between" data areas in the CD track. Just hiding there. I don't remember him from the game. Just wanted to make sure/double check.

 And I'm pretty sure this isn't in the game either

 No idea what that's from. Doesn't look related to the first image.

[sunteam_paul]

Doesn't look familiar but I'd have to play it through again to be sure.

[Necromancer]

He doesn't look familiar to me either, but there's so many different enemies in that game that it's hard to remember 'em all. 

[hoobs88]

Is 'Crest of Wolf' the Japanese version of 'Riot Zone'? I always thought it was a different game.

[sunteam_paul]

Is 'Crest of Wolf' the Japanese version of 'Riot Zone'? I always thought it was a different game.

Same game.

[Necromancer]

The levels were swapped around, so they are a bit different, though still the same game of course.

[Tatsujin]

right. the same boring shit, just the other way around.

[ccovell]

It could be an unconverted sprite/graphic from the arcade version...

[Tom]

The levels were swapped around, so they are a bit different, though still the same game of course.

 The levels are swapped around??? I don't remember this. I know the arcade version of the game has different level arrangement (as well as different enemies and such), but nothing of US/JP versions.

Edit: Chris is right. Left over graphics from the arcade conversion. Playing it on MAME, you can see this guy in the first level.

 I corrected his palette to the arcade one and changed it for PCE color format.


 The other pic is of second player continue screen of the arcade.