Richard is the kind of person who is very lazy and unwilling to do things, even for the simplest task. He inherits these traits from his mother, Granny JoJo. He stays at home and spends most of his time playingor watching television. He has a large appetite and is a very voracious eater.
Richard, like his son Gumball, occasionally does not wear any pants. He would have to be told to or be forced to wear pants by Nicole. An example of that would be in The Responsible when Nicole had to put his pants on him and had to make it tight enough to keep the pants on him, until the button on his pants flew right off.
He is very childish and somewhat stubborn, a fact which Nicole and Anais point out frequently. He has a similar sort of stupidity to his sons, and sometimes, all three use their silly antics to create foolish ideas. Despite all of this, he may have a little bit of responsibility lying in him somewhere as he loves his wife, his sons, and his daughter. He seems to be somewhat irresponsible of his actions/decisions. An example of him being irresponsible would be in The Spoon, when he sent Gumball and Darwin downtown to a at night to get his wife a birthday present without any supervision.
In The Dress, it is shown that he does not listen to instructions/directions well, as he did the laundry even when Nicole told him not to, causing the laundry to shrink.
When he was a child, he used to run around at school pretending to be his alter-ego, "The Cottontail Cavalier". Many of the other classmates laughed at him, but Nicole liked him for who he truly was. Nicole had to confiscate his cape and say that the President wanted it, the fact that Richard still resents in adulthood.
Richard, despite being gullible, is shown in The Laziest to be somewhat clever. He tricks the boys into thinking he gave up when Nicole showed up and tricked her into thinking he was hard at work while the boys were lazily sitting on the couch, simply to avoid doing his chores.