There’s at least a place where Goku can name a new form “Super Saiyan 5” if he wanted to. Dragon Ball Daima takes place shortly after the events of the Majin Buu arc, but before Beerus and ...

Only Goku has mastered Kaioken, using up to x20 but never combining it with Super Saiyan. Combining Kaioken with SSJ is risky due to the emotional stress of SSJ affecting ki control. Kaioken is ...