Deadpool
The Merc With a Mouth brings all of his skills and quips to Ultimate Alliance 3, and he’s one of the best melee-focused heroes in the game. Deadpool plays similarly to characters like Elektra or Gamora, but he’s just a bit stronger than the other sword-wielders.
Deadpool’s teleportation abilities make him super useful for darting around the battlefield, and his double-jump covers a lot of ground quickly. His Slice & Dice and Katanarama abilities can also hone in on enemies quickly, and cause a lot of stagger damage
His Eat Lead ability is great for causing a ton of damage quickly, especially while an enemy is staggered, and it can easily be combined with other heroes for a Synergy attack.
There are two other aspects that make Deadpool a good choice, the first of which is his ridiculously high durability. He can take a beating with the best of them, which is useful during those long boss battles with a lot of damage. Making matters even better, Deadpool is one of the few characters in the game with Healing Factor, making his health constantly regenerate.