Mick is not the brightest tool in the box, which is probably why he volunteered for the BoS. They took him because he is handy with a gun. Reasonably strong and agile, he has the potential to become a good frontline soldier.
Mick strongly resembles the appearance of one of the Fallout Tactics concept artists - Tariq Raheem. The similarity is visible even better when compared with Tariq's self-portraits. Yet it is not known whether this similarity was done on purpose.