you've probably seen this guy in the unused sprites and concept art sections, but there's a lot of mystery and controversy surrounding this guy, mostly because i'm responsible for most of it. here we will sum up the facts about the strange characters and state what is true and what is false.
Well, durr. He never shows up in any of the missions, nor is he reinstated in the console ports. He is not mentioned or alluded to in any official Metal Slug materials, and he is only visible in one piece of concept art. Indeed, the only two places in the game he shows up are in the sprite viewer, and in an unused area likely used for testing enemy code.
Kind of arguable, I guess. Aside from a wonky projectile and an unsuitable area to test him in, he otherwise acts like he should - he protects you from behind with short-range explosives. He doesn't quite have the finesse of Hyakutaro's behaviour, [but it's not like he's glitching the game with his presence or anything. there's certainly been worse power-ups in the series.]
No! No no no! No! Totally wrong! Incorrect! Nada! Zippo!
As aforementioned, the guy's never had a mention in any official material and goes unnamed in his sole concept art appearance. Unlike Hyakutaro, Rumi and others, he doesn't have a unique identifier during the prisoner tally screen - his image doesn't appear nor does he have a set, unchanging name.
WHAT ARE YOU EVEN DOING
THIS IS NOT THE METAL SLUG WIKI YOU CAN'T JUST MAKE SHIT UP
GET OUT OF HERE