Star Wars vs Fate
Connection:
Both are knight of light who protect the innocent
Both are prodigy swordsmen
Both are honorable
Both are chosen warriors (Luke being The Chosen One in Star Wars franchise, and Saber for being Chosen as King of Britannia after pulling out Caliburn from the stone)
Both wield swords (Lightsaber and Excalibur respectively)
Both have family issues (Anakin Skywalker/Darth Vader to Luke and Mordred Pendragon/Saber Red to Artoria)
Both came from series with multiple different timelines (Canon and Non-Canon)
Both once corrupted in alternative timelines (Luke was corrupted in Star Wars Force Unleashed Non-Canon/ Bad Ending, and Saber being corrupted by Angra Mainyu "All evil in the world" during Heaven's Feel Arc)