Fortnite has hosted numerous crossovers with seemingly ill-fitting IPs, so it’s hard to be surprised by any collaboration anymore. That is, until they decided to give Sora from Kingdom Hearts a gun.  Fortnite’s latest crossover sees the world of Kingdom Hearts invade the battle royale this week.On Thursday, September 17, four Kingdom Hearts skins will be available to purchase in Fortnite’s item shop as part of Chapter 7, Season 4. Players can don the looks of Sora, Kairi, Riku, and…