Making a "fake image" from values in-game? (so you can't rip the sprite)

I'm planning to make a pixel game in the style of NES games, and I want to hear if this little thing would be possible in an extension.

Basically, I'd want to have a secret character/entity whom I'd like to remain a secret until discovered deep in the game, and not by—for example—ripping the sprites out of the game.
The sprite would be extremely simplistic, in a size of something like 32x32 pixels (or smaller, maybe). Only using up to 3 colors; transparent, black, and white (or just 2 colors if it's necessary).

I'm thinking of a 32x32 array that would hold values like 0, 1, 2 (each representing a predefined color), which could then be interpreted into a "fake image".
I'm saying "fake" because it shouldn't be an actual bitmap file which is generated at runtime, because then it would be rip-able from RAM when the game is running.
I'm not that big on graphics-programming, but I imagine there could be a way to have a particle-like system to host a bunch of 1-pixel-sized objects with a color corresponding to that objects coordinate in the array, and then maybe even have the transparent ones be non-existent if possible. Or maybe by utilizing some form of vector-graphics if that's possible in Clickteam. If this "sprite" should be animated then it wouldn't be any more than 2 frames.

This thing would be solely to have an actual secret which won't just be ripped from the game, I realise that hardcore hackers could find this secret but since everyone can rip textures these days I imagine that doing this would go a long way to secure the secret.

Any answer/help is appreciated.

To me, that sounds more complicated than doing what I'm trying to do.

I think this is actually a very simple task because of the fact that the sprite would be very small, and only have 2-3 different colors (including transparency).

I'm not trying to do this because I know people will rip all the sprites out of the game to find all the secrets, I'm doing this in case people will do it. I haven't heard of any game that's done this exact kind of thing before (at least not for this exact purpose), so I thought I'd give it a shot.