Tetsuya Naito
On January 5, 2020, Tetsuya Naito won the Heavyweight and Intercontinental Championships. Both titles kept their individual history, but were defended at the same time. Sometimes, they were called "Double Championship". One year after Naito's victory, the NJPW President announced the unification of both titles, deactivating the Intercontinental title and forming the new IWGP World Heavyweight Championship. On March 4, 2021, the Double Champion Kota Ibushi defeated El Desperado to unify and retire both titles.