Bomberman?
Not Bomberman.
This might be a Donkey Kong. I’m thinking (blank) letters means Kong Letters. I’ll say it’s Donkey Kong Country 2: Diddy’s Kong Quest
edit: I don’t think that’s right, now that I read it some more. That doesn’t sound like how those letters function
It feels very mascot platformer to me… Maybe a Crash game?
I have no clue where they would print a middle finger in a manual that looks like it’s from the 90s.
Uh…I have no clue.
The gloved hand reminds me a bit of Devil World, I guess?
Conker’s Bad Fur Day
Throwing out a random guess: Dynamite Headdy?
Mascot platformer is correct, 90s is correct. Neither Donkey Kong Country 2 or Dynamite Headdy, but correct platforms.
If I show anything else I will give it away immediately.
Boogerman?
Rocky Rodent?
We’re talking full blown undeniable mascot.
Cool Spot
Sonic and Knuckles?
That’s right! For whatever reason Cool Spot is giving the finger in the manual.
Bonus material!
Me and Alicia talked about this once:
Well crap, in the process of taking this photo I discovered my copy of this game is missing:
Edit: Looking at that Cool Spot, it seems like maybe he’s doing the rock music 
but it translates poorly to four fingers.
Dune?
Ys 5?
