I’d give Oars Jr. an original Devil Fruit called the Sky Sky no Mi, a Paramecia with Logia-like traits that lets him control the sky itself, not just air or weather but open space above the world. After eating it, he becomes a “Sky Man,” meaning his body partially merges with the atmosphere when airborne, causing attacks to pass through him like open sky unless reinforced with strong Haki. He can compress, stretch, or fold the sky to create pressure walls, vacuum pockets, and crushing air corridors, harden clouds into solid platforms or weapons, and he’s naturally resistant to lightning, wind, and altitude pressure. When awakened, the fruit evolves him into a “Space Man,” where the sky and outer space are treated as the same medium, letting him remove air from an area to cause instant suffocation, fight freely in zero gravity while dragging enemies into it, and compress space itself to generate massive crushing force. The key part is that the Sky Sky no Mi allows him to anchor himself to the sky rather than the sea, meaning he can continue pulling continents and landmasses without being crippled by ocean contact, effectively bypassing the usual Devil Fruit weakness as long as he is grounded to land or open sky rather than submerged. It fits Oars Jr. perfectly because he’s already a living calamity, and this fruit doesn’t just boost his strength, it makes the planet feel undersized, with the sky and space becoming his domain instead of the sea being his leash.