Alex is a middle-aged man of average height and build, standing in at 6'0". He has green eyes, a long, square shaped face, and short red hair resembling the color of gingerbread. He has thick, squarish eyebrows that are darker than his hair. He has a pale complexion and dark freckles scattered across his face. Alex's alcoholism, accompanied with other sources of stress, have taken visible tolls on his skin and make him look older than he actually is; He has forehead creases, crow's feet, under eye wrinkles, and defined smile lines.
Alex is seldom seen without his rectangle shaped glasses. Even in the comfort of his own home, he looks dapper and well-dressed, often sporting sweater vests, dress shirts paired with ties, and slacks.
From what we've seen, Natalie and Alex have a very good parent-child bond, although he is gullible to an extent as Nat manages to fool him into believing Satan is "Stan", even if there was apparent evidence to doubt her.
He treats "Stan" very well and invited him to stay over for dinner when they first met. It is yet unknown how he will react to realizing who "Stan" actually is, but fans have theorized about a very wide range of reactions (detailed below).
No interaction between them has yet been depicted in-canon but it's safe to say that they have good relation because of Michael's friendship with his daughter.