In that interview with Ruben, Ruben said he'd been surprised by how funny John is.
I think he's someone who seems normal at first glance but is a bit odd once you get to know him, probably (mostly) in a good way.
His teammates always seem to really love him. Like, can you imagine having a colleague name their dog after you? That's not just a shared sense of humour, it's genuine love and heartfelt belief that that relationship won't sour.
Boring people don't get that kind of love. He's definitely a bit of a weirdo.