I figured it out. Dan is a boy, he's a 12 year old that never grew up. The way he eats, how he doesn't drink coffee or tea, he never tries new foods. He loves wrestling and has action figures and still has his pogs. His general lack of life knowledge. He loves all the things a 12 year old from the 80s would love and his tastes never evolved.
Not saying any one of those things are bad or childish. But if you described the personality traits of Dan Rykert to me out of context I would assume you were talking about a kid.
That's a perfect way of looking at the enigma that is Dan Rykert. He is pretty much captain marvel.