He unironically uses "gnarly" as a compliment, so I think anything can be a swear if he applies himself. Also he had no idea celestial was even a language!

Also I just really enjoy that part of why their CR works so well is that Ryan is so willing to try things and learn stuff because he doesn't remember any of the baggage he had from enduring a standard education. He doesn't remember that he grew up being treated like he was stupid! So even though he approaches her like a goofy goofball, he's always like genuinely curious and willing to ask questions (even when they're weird) and she doesn't have reason to treat him like he's too dumb to understand. It's a nice dynamic they wouldn't have somewhere else!