I immediately have issues with your comment, Arbitrary.
"Dark Mind was severely wounded and Landia was split up into four mini-dragons." My issue: Ahhh... You know, you jumped my case earlier about using feats not in Mario's profile. To be specific, I brought up Dreamy Bowser, Culex and Chakron. Now, I searched Kirby's profile for explanations on feats you were bringing up, and all I found about Kirby scaling to anyone was Dark Nebula, Claycia, Marx, Nova, Lor Starcutter and Dark Matter. Nothing about Dark Mind or Landis. So, really, you shouldn't have jumped my case when you did something similar here. Regardless, that's not important. Back to debating! Also, Kirby is
NOT Multi-Solar System Level+. That plus is important when debating and can make a difference.
Also, what Fox said. Bowser survived it, and Mario has kicked Bowser's ass 200+ times at our current date. Also, Galaxy Mario does have another Universe Level feat. Super Mario Galaxy 2, aaaaaaaaaand,
Explanation Time!
So, in Galaxy 2, Mario defeats Bowser. No surprise there, but, you know the Black Hole taking up World 7? Well, Bowser created it. The reason being is at the end of the game and after Bowser's first phase, Bowser roars and
creates a Black Hole.
But, not just any black hole, THE black hole on the world selection screen. Here's the scene, for reference.
https://m.youtube.com/watch?v=1BvKt4pRWmE
As you can see, Bowser roars and created a black hole. After defeat, he falls into it and it blows up, and suddenly, that world no longer has the black hole there.
Next, how is it Universe level? Easy to explain. Please look at the world selection screen. Now, look at them. Notice how they progressively get bigger? From planet, to solar system, etc. And World 6 has
countless galaxies in the background.
So, think of the pattern they follow. World 6 has countless galaxies, so World 7, the world being consumed by Bowser's black hole is even bigger. So, Galaxy Mario is Multi-Galaxy Level to Universe Level in both games, effectively dwarfing Kirby. And Fox showed Mario actually does get the MFTL+ reaction speed, so, it all comes back to before. Kirby can fly circles around Mario all he wants. But once Mario lands the hit, it's over. I still say Mario wins with low-mid difficulty solely cause he has to work hard to actually hit Kirby.