LogFAQs > #979681192

Liquid had the dominant genes. Demonstrated by him having dark hair that got bleached by living out in the desert sun all of his youth.

Solid had the recessive genes. Demonstrated by him having blonde hair in the briefing tapes. He asks for hair dye so he doesn't get confused for Liquid.

The game is about nature/nurture. Liquid was genetically superior, hence why he survives fucking everything but FoxDie, but he was always told he was a little bitch. This meant he could never embrace his gifts and maintained a victim complex which held him back.

Solid however had no personal ambitions and he always went along with what others recommended. He was put in situations repeatedly that he wasn't prepared for and he always barely scraped through. This cemented his resolve and self-belief and allowed him to shake off others' expectations. This lead to him growing beyond what people thought possible.

Be a slave to destiny or learn to be your own man.