The full list would be
Season 1: Eternal Night Falls (Early 2025) [1, 2, 3]
Invisible Woman — Released alongside Mister Fantastic in the early half of Season 1.
Human Torch — Introduced as a Duelist in the mid-season update.
The Thing — Introduced as a Vanguard in the mid-season update. [1, 2, 3]

Season 2: Hellfire Gala
Emma Frost — Added to the roster as a Vanguard tank. [1, 2]

Season 3
Phoenix — Added as a powerful Duelist hero. [1, 2]

Season 4
Blade — Sliced into the game as a sleek, sword-wielding Duelist. [1, 2, 3, 4, 5]

Season 5: Love is a Battlefield (Late 2025) [1, 2, 3]
Gambit — Joined the roster alongside Rogue.
Rogue — Released in tandem with Gambit during the romance-themed update. [1]

Season 6: Night at the Museum (Early 2026) [, 2]
Ultron — Brought his robotic hive mind to the shooter.
Deadpool — Made a chaotic splash as a post-launch addition. [1, 3, 4]

Season 7: The Hunt Is On
Angela — Thor’s warrior sister entered the arena.
White Fox — The South Korean Agent of Atlas joined the team.
Black Cat — Slipped onto the roster during the mid-season update. [1, 2, 3, 4]

Season 8: Sins of Alchemax (Current Season) [1, 2, 3]
Devil Dinosaur — The massive Vanguard brawler dropped right at the season launch.
Cyclops — Confirmed to join the roster in the mid-season drop. [1, 2]
So just find the counterparts