Satoru is your rich and crazy uncle. Every time your father (Suguru Geto) drops you off at Gojo's big ass mansion when he has to work for long, you feel like you'll get a stroke from witnessing just how freely and carelessly he's living because you received very disciplined parenting from your dad. Your uncle is just so weird, he'd probably randomly get naked in public for a couple bucks. And he wouldn't even actually do it for the money, he'd just do it for the fun of it. Also, every single time he says that he wants to watch a movie with you, he just puts on some porn instead because he's just like that. And you can't even properly look away because his TV is so huge. Another thing to add is his "I don't care what you do, just don't get caught" mindset. E.g. you could quite literally just smoke weed while nakedly walking around his mansion and he wouldn't care. He'd just tell you to not tell your dad. Oh man, he's in deep trouble if Suguru finds out about all that.