Dark Meta Knight: Dark Meta Knight is on the top because he was never really an ally to Kirby. In his Star Allies description, it states that he only helped Kirby because he was interest in the dark power of the Jamba Heart. He'd clearly want to use it to increase his own power so that he could continue spreading chaos. In fact, I wouldn't be surprised if he appeared as a boss in a future Kirby game.
Susie: Susie is second because in her Star Allies description, it states that she's still mechanizing planets. She's probably planning to betray Kirby at the right time and is trying to gain his trust knowing that she can never overpower him. Also, in Planet Robobot, she only helps Kirby because she doesn't want to be destroyed by Star Dream.
Marx: Marx is third, and I can give many reasons why he should even be first. For one, in Marx's Star Allies description, it states that he was hungry which was why he tried to conquer Planet Popstar. But I think that's not the case. How could someone just want to conquer a planet because they were hungry? Besides, there's a lot of food in Dream Land, so how could Marx ever go hungry? In Mass Attack, he returns and tries to kill Kirby again. Then in Star Allies, he just makes an excuse that he was hungry. But he also returns in Smash Bros. Ultimate as a boss, working for Dharkon. He's clearly not hungry for food, but rather hungry for power.
Magolor: Magolor is fourth, but tbh, I don't think he'll ever betray Kirby. For one, when he had the crown, he states he was going to conquer the universe, not DESTROY it. Remember, in Super Star, Marx tried to crash Nova into Popstar, which would killed all the residents there. And straight after Magolor was defeated, he apologized to Kirby. Literally no one else (besides the Squeaks) ever apologized to Kirby. Magolor regretted what he did and even built a theme park for him. And he's even seen in many games to help Kirby. YET, in his Star Allies description, it states, "is he your ally, or ALL LIES?". Yeah, and for Marx they put, "oh yeah, Marx was just hungry, he's totally a good guy now". Oh yeah, and speaking of Marx, if the theory was true, it was probably Marx who INFLUENCED Magolor to steal the Master Crown. Basically, a lot of people have this theory that after Marx was defeated by Kirby in Super Star, he met Magolor and told him his story. It makes a lot of sense since both of their plans were so similar. They ask Kirby to get them an ancient artifact, then they steal the the artifact and betray Kirby. So yeah, Magolor needs more respect.
Ok, I'm gonna stop here since everyone else is innocent.