Mickey is a homeless man who claims to have served in the US Army, allegedly losing his left arm in battle. He can be found opposite Keane's Saloon in Valentine, begging for money, or even just a conversation.
Events of Red Dead Redemption 2
Arthur Morgan can encounter Mickey and talk with him on several occasions, making Mickey happy that someone is sparing him the time of day. When Arthur is dying of tuberculosis, Mickey comforts him, and admits to Arthur that he was not actually a soldier and is just trying to gain sympathy.
In the epilogue, John Marston can have similar encounters with Mickey eight years later, with not much having changed. Mickey tries to hug John, but he refuses. John also informs Mickey of Arthur's death, whom he mourns.
Mickey is an extremely lonely man, who has almost no human contact whatsoever. It is likely that Arthur and John are the only people he has ever actually spoken to in decades. His speech is awkward, repetitive, and strained, but he is very thankful towards anyone willing to stand him for more than a couple seconds. However, Mickey is still desperate enough to take advantage of people's generosity by pickpocketing them if he can.
Mickey is an overweight man with a beard, and he wears a worn out Civil War-era U.S. Army military uniform. He has a missing left arm, which he claims he lost during the war.
I fought in the war. I fought for you.
I'm too old to get a job, mister. Way too old... can't we be friends?
You're like a brother... but I didn't learn your name, and I said to myself, Mickey, you never learnt that fella's name. Now, you'll never see him again and you'll be sad like... when your puppy passed, 'cause you slept on it...
—Mickey to Arthur
I fought in a war, mister. I did. Sent me strange seeing all them... fellers die. I... I saw terrible things. I ain't been the same since.
—Mickey about his past
It's nice to be held sometimes. Oh, we used to hold each other in the war.
I just kinda like folk but... most folk don't like me
—Mickey to John
Ain't ever harmful to be held, mister; only most folk find me creepy and strange, which ain't nice.
—Mickey to John
Mickey once had a puppy, which he accidentally killed by sitting on it.
Mickey claims that he was once assaulted by Tommy.
The three chevrons on the sleeves of Mickey's coat indicate that he is wearing a sergeant's uniform.
Mickey’s charade is initially convincing because Civil War veterans migrated to the postwar West in great numbers. Those who did so often had served in combat-heavy units and therefore suffered trauma and mental illness at greater rates than those veterans who managed to successfully re-engage in the civilian life of their hometowns in the East after the war. Struggling Civil War veterans were not an uncommon sight in the postwar West, particularly among isolated small towns.
It is possible to kill him, although he cannot be lassoed or hogtied.
Making friends with Mickey will raise the player's Honor, as well as giving him a hug.
The second encounter the protagonist has with Mickey by the Valentine Station.