Lux Arcadia (Undefeated Bahamut Chronicle); via End Action
Merlin (Seven Deadly Sins); via Infinity
Doma (Fire Punch)
After acquiring the Rhythm Badge, Miles "Tails" Prower (Sonic the Hedgehog) is able to perform the Rapid Tails Attack, a continuous, uninterrupted chain of tail attacks, only ending when he chooses to end it.
Johnny Joestar's (JoJo's Bizarre Adventure) Stand, Tusk ACT 4 has the power of Infinite Rotation, the damage caused by it is infinite and will never end unless Johnny were to apply another similar rotation moving the other way, resulting in them cancelling each other out.
Alphamon (Digimon) can use its signature "Alpha InForce" to repeat any attack it lands a countless amount of times in a single instant, continueing until its opponent is defeated.
Lux Arcadia (Undefeated Bahamut Chronicle) via End Action.