Takes on a mantle or position upon that absence or death of a certain character. This can either be someone who gets promoted to a position captain or team leader following said events or someone who dawns a superhero/supervillain alter ego after the previous one dies or retires.
Becomes Batman in the Future.
Becomes Batman following Bruce Wayne's apparent death.
Becomes Robin after Jason Todd's death and becomes Batman during Battle of the Cowl.
Becomes Robin after Tim Drake became Red Robin.
Becomes Batman in the future.
Becomes Superman in the future.
Becomes Superman in the future and fills the void of Superman during the death of Superman.
Replaces Ultra Magnus the leader of the Autobots following Ulta Magnus' death. Also was the Matrix of Leadership's chosen successor to Optimus Prime. (Marvel Universe)
Replaces Duke as the leader of the GI Joes' field team following Conrad Hauser's departure from the Joes. (Image/DDP Universe)
Replaces Kirk as Captain of the USS Enterprise.
Replaces Picard as Captain of the USS Enterprise during Picard's Reign as Locutus Of Borg.
Normally he holds Spock's position on the USS Enterprise.
Becomes Nighthawk after Kyle Richmond dies.
Becomes Black Mask after Roman Sionis dies.
Briefly becomes the Joker.
Becomes Captain America after Frank Castle gives him the Captain America costume.
Becomes Captain America after Steve Rogers dies.
Becomes Wolverine after James Howlett dies. (Ultimate Universe)
Becomes Spider-man after Peter Parker's apparent death. (Ultimate Universe)
Briefly became Spider-man.
Replaces Ben Reilly as the Scarlet Spider. Briefly became Spider-man.
Became the Green Goblin after Norman Osborn presumably died.
Briefly became Green Goblin.
Was both the Green Goblin and the Hobgoblin for a period of time.
Was created by Unicron to replace Megatron and became the new leader of the Decepticons. (Marvel Universe)
In the Marvel Universe, Galvatron is created from Megatron's remains and becomes the new leader of the Decepticons. In the IDW Universe, Galvatron and Megatron exist at the same time, but Galvatron has aimed to replace Megatron as the leader of the Decepticons.
Was appointed by the Cobra Council to become the new Cobra Commander following the death of the original. (IDW Universe)
Was chosen Optimus Prime to become the new leader of the Autobots. (Marvel Universe)
Replaces Pike as the new captain of the USS Enterprise.
Becomes the new Robin after Dick Grayson quits. Also poses as Batman during Battle of the Cowl.
Becomes Batman's new Robin during the Dark Knight Returns.
Briefly becomes Robin after Batman uses her to be Tim Drake's replacement. Becomes Batgirl after Cassandra Cain quits.
Becomes Batgirl after Barbara Gordon is paralyzed.
Becomes Snake Eyes after the original dies. (Marvel Universe [Happens in IDW's continuation of the Marvel GI Joe run])
Also becomes Snake Eyes after the original dies. (Marvel Universe [Happens in IDW's continuation of the Marvel GI Joe run])
Becomes Wolverine after James Howlett dies.
Becomes Captain America after Steve's age catches up with his body.
Becomes Captain Marvel after Mar-Vell dies.
Temporarily becomes Captain Marvel when Genis-Vell goes on hiatus.
Becomes Captain Marvel following the Dark Reign.
Becomes Superman in the future.
Becomes Batman in the future.
Becomes Batwing after David Zavimbe quits.
Becomes Batman during Knightfall.
Becomes Superman during the Death of Superman.
Becomes Batman after Bruce Wayne dies. (Earth 2)
Becomes Superman after Kal-L dies. (Earth 2)
Replaces Sentinel Prime as the leader of the Autobots. (Marvel Universe)
Replaces Zeta Prime as the leader of the Autobots. (IDW Universe)
Replaces Sentinel Prime as the leader of the Autobots. (IDW Universe)
Replaces Hawk as the GI Joes' field team leader following Clayton Abernathy's promotion to director of the GI Joe initiative. (All Continuities)
Replaces Duke as the leader of the GI Joes' field team following Conrad Hauser's departure from the Joes. (IDW Universe)
Was appointed by the Cobra Council to become the new Cobra Commander following the capture of previous Cobra Commanders Krake and Tomax. (IDW Universe)
Was appointed by the GSA to replace Captain America after Steve Rogers was fired.
