Due to ingesting a serum before the first World War, Brit's physiology was changed permanently.
Invulnerability: He became absolute invulnerability, thus he is immune to all forms of damage, he is immune to bleeding or loss of limb. Brit has shown to be impervious to all attacks that has been dealt to him, and immune to all diseases. Brit has had a building collapse on him with no effect happen to him . He has walked through magma, which is can be 1300 °F to 2400 °F and it hasn't burned or broken through his skin or cause him any harm. . He has been hit by Supreme Leader Cho, who is strong enough to break Monster Girl's bones, and has not been harmed by him Robot, a character with Genius Level Intellect, even said he knows he can't kill Brit, even with his upgraded armor . Best Tiger, a character that is also a genius, has said that killing Brit would be "impossible" . He possess absolutely no internal or external weakness, essentially making him completely indestructible.
Increased Strength: After drinking the serum and going through the transformation Brit's physiology become indestructible and perfect. His physical appearance, muscle mass, etc. were enhanced and perfected, thus becoming extremely attractive and handsome. Brit became a tall, brawny man with a an attractive, deep, silky and compelling voice and overwhelming authoritative charisma. He permanently has flawless skin, perfect dentition, beautiful hair on his head, "perfect golden-proportioned body," brawny and well-toned muscles, and he is extremely "well-endowed". Due to his invulnerability Brit is able to use 100% of his body's muscle mass, increasing the his strength, even without training his muscles are brawny and his body shape doesn't change no matter how much calories he intakes. He has shown to be able to lift objects many times his own body weight.
Increased Agility: His invulnerability even allows Brit to consistently utilize a range of motion in his acrobatic maneuvers which are impossible for normal humans since as his bones won't fracture and his body won't damage.
Increased Reflexes: His reaction time seems to be in proportion with his enhanced strength in that he has been seen being able to intercept incoming bullets with his bare hands with little effort, and no damage.
Decelerated Aging: Brit has live for more than a century and still in his physical prime, his healthy cells maintain his youth indefinitely.
Brit starred in three one-shots: "Brit" (July 2003), "Brit: Cold Death" (December 2003), "Brit: Red, White, Black and Blue" (August 2004). Robert Kirkman wrote the three one-shots with Tony Moore illustrating the first and second issue and with Cliff Rathburn on the third. The one-shots have been collected in a trade paperback and was released in March 2007.
In August 2007, Brit was launched as an ongoing full-color series written by Bruce Brown and features Rathburn's debut as an ongoing series artist. The series was overseen and edited by Kirkman. As of the second issue, Andy Kuhn came aboard as the series' breakdown artist. In the seventh issue, Rathburn was replaced by Nate Bellegarde as the new artist. The series expanded Brit's universe by introducing his brother and Sister and also revealed the origin of his powers.