Well, if the Asgore battle is any indication, having an extra color is perfectly justified--after all, his trident was red the whole time, unless he used it to attack, since it'd change color. owo

This is seriously amazing, though, 0-2 looks perfect in this style! 8D

That and technically, he does get orange and blue eyes for that specific attack.

And yeah, since it's already solid white, he fits in VERY well. =3

I kinda wanna see this animated XD looks real nice

|B you know, it's just now hitting me how big of a Kirby fan you must be, like aside from the thing you did of your Muu buddy, all your undertale crossover stuff has been kirby, and it's all looked really nifty too!

And yeah, the extra colors are justifiable for final boss sorts, though they tend to be more in the "background has weird gradients" department than the sprite being particularly colorful, but this works here. I could see O2's red feathertips having a red trailing effect similar to asriels, even if that never really happened in the kirby games

The game referances Earthbound by being all cutesy like but have very serious moments, Kirby is kind of the same when you think about it. =P So the crossover just fits. And yes, I am a big Kirby fan!~

Asgore has a red trident and the blue/orange eyeflashes. =P And Sans has his glowing eye.
That would make sense if you think of them being bloodsoaked, so they leave a trail. =3

Plus 02 also has some plant aspects, because, ya know, the little cactus thing that serves as one of his weak points

Yes, that is true.

Being solid white and all that.

The Dreamland series of games are ones I really need to beat someday, really.

Granted this guy is at the end of Kirby 64. =P

Kirby 64 really feels like Dreamland 4 though, ya know?
It has a lot in common with Dreamland 3.

There are similarities I will give you that.

I can just imagine the bullet hell with this

All those likely red bullets from his eyes. =P

And the toxic gas from his tail.

Oh yeah, that too. =P It's easy to forget that attack.

ACTUALLY, this is more fitting that one might think.
Since the only other color that was featured in the black and white sprites was a VERY dark red color.
Just look at Toriel's sprite for example. Her eyes are that red color.

I never really payed attention to that. But many of the final bosses in Undertale have some color, and a certain photoshop monstrosity breaks all the rules about the games limitations. =P