Dungeon of the Endless and Alpha Protocol.
Michael Thorton, Sis, SIE, and a number of other characters appear as heroes in Dungeon of the Endless.
Michael's skill tree is somewhat unusual for DotE - he can spec into one of three trees/skill types when it comes to offensive skills - Shotgun + Pistol, Martial Arts + Toughness, and Assault Rifle + Submachine Guns. The various trees provide Thorton with special abilities he can use in combat, including:
Shotgun Skill:
Room Sweep - Active Ability. Thorton pulls out a shotgun and uses it for several seconds, causing every single attack to be ranged and cause knockdowns for the duration of the ability, stunning opponents.
Pistol Skill:
Chain Shot - Active Ability. Thorton pulls out a pistol and fires up to six shots at various enemies, prioritizing bosses. The shots all inflict critical hit damage.
Martial Arts Skill:
Fury - Active Ability. Thorton's melee attack, defense, movement speed, and attack speed all increase for the duration of the ability.
Toughness Skills:
Iron Will - Active Ability. Thorton gains a temporary health boost and a damage reduction for the duration of the ability. Thorton cannot die from the temporary health disappearing.
Hard To Kill - Passive ability that Thorton does not start with. When Thorton runs out of health, he gains temporary invincibility and remains alive, with very, very little health. This ability only works once. The next time? Let the tears flow.
Rifle Skills:
Focused Aim - Active Ability. Thorton pulls out an assault rifle and begins firing. Each burst inflicts a lot of damage. The assault rifle will last for the ability's duration.
Submachinegun Skills:
Bullet Storm - Active Ability. Thorton pulls out a pair of submachine guns and sprays them at his enemies, attacking very, very quickly for the ability's duration.