Kid Icarus Uprising runs on the same engine as Super Smash Bros. for Wii U, so it should be compatible with Citra. However, there are some differences between the two games that may cause issues. For example, in Kid Icarus Uprising, Pit can double jump and air dodge, which would be difficult to replicate in Citra. Additionally, the game features a new weapon system that doesn't exist in Super Smash Bros. for Wii U.