Infinity Countdown #4Aaron Kuder, Gerry Duggan, Mike Deodato Jr., Mike Hawthorne, Nick BradshawInfinity Countdown, book 8

Characters in Infinity Countdown #4

3 characters, main characters first.

Main characters

Adam Warlock
Artificially created cosmic being with deep ties to the Infinity Stones and the Soul Gem.
Also in Infinity Countdown Prime #1, Infinity Countdown #2, Infinity Countdown #5

Antagonists

Ultron
Rogue AI, here empowered by an Infinity Stone and seeking to remake existence.
Also in Infinity Countdown #2

Supporting characters

Nova (Richard Rider)
Human member of the Nova Corps wielding the Nova Force.
Also in Infinity Countdown #2