Earl Marion is a powerful-looking black man. He supports the NCR as the future of the wastelands and is very friendly towards New California Rangers. Around 2241 he got into a nasty accident and ended up with a crippled leg. Unable to perform his duties, he had to rely on external help - something the Chosen One could do.
The Chosen One's line "I'm here in town to kick ass and chew bubblegum - and I'm all out of gum." is a quote taken from the movie They Live. It will be responded to by Marion with a modified quote from Wyatt Earp "You gonna do somethin'? Or are you just gonna stand there and bleed?", a reference to the movie Tombstone.