"I swear you will be disappointed by this account," the caption to the video reads.
Ryan later shared a photo of himself topless in Deadpool make-up before using a filter to add a Wrexham AFC shirt.
Ryan's TikTok debut came on the same day the soccer team announced the platform will be the team's new shirt sponsor.
In the third clip, he and McElhenney riff on the Beastie Boys' "Sure Shot", with Rob rapping, "TikTok, you don't stop."
Meanwhile, Ryan recently revealed he has never actually met Rob in person as they've had all their meetings over Zoom calls because of the COVID-19 pandemic.
"We Zoom and text every day," he explained. "We're kinda like work spouses. Everything we've done has happened during the pandemic."
"Rob was somebody I had always admired, because he's an engine of creativity. Then I saw (him do) The Dance (on his sitcom), and I couldn't not reach out. Like a classic fanboy, I DM'd him just to say how much I admire him, and I sent him a case of Aviation Gin, because I'm nothing if not a pusher."