Green Lantern dominates space too much for Samus to really have much of a niche there. As others said, she'd fit better at Marvel and their shit hole of a cosmic universe. That said, I wouldn't want her anywhere near Marvel and its shit writing. They'd make Metroid other M's story look like Shakespeare. If she would fit in any franchise, I would say Dr. Who.
If anyone would fit well in DC or Marvel, it would be Doomguy.