Soap is the youngest recruit ever accepted into SAS history, which has shaped his personality: he’s ambitious, confident, and occasionally prone to adventures. Despite these traits, he's unfailingly loyal to Captain Price and the ideals of his unit, always prioritizing mission success over personal safety.

Unlike the stern Ghost, Soap is sociable and charismatic. He often lightens tense situations with jokes or brief comments. His ironic dialogues, especially during missions such as “One Shot” in Modern Warfare II, have become his trademark. He enjoys teasing colleagues but does so without malice.

Despite being amiable outside combat, in battle Soap transforms into a calculating and efficient killer. He lives up to his nickname (“Soap”), clearing rooms quickly and cleanly. The spirit of a true Scottish warrior resides within him—he never backs down, even if the odds are stacked against him.