Honestly, I don't see many stories tagged specifically with that pairing unless you go looking in crossover tags. Most of it seems to blend gaming RPF with other characters. The popular stuff often puts Dan in survival mode with other YouTubers' personas, or has him getting pulled into game worlds from 'Minecraft' or 'Fortnite'.
A lot of writers go for adventure and hurt/comfort—Dan getting stuck somewhere, or his friends having to save him from a glitch. I've seen some cute fluff fics where the focus is on friendship and collaboration, building stuff together. There's also a surprising amount of sci-fi AU content, like casting his persona as a space explorer.
It's definitely a niche corner, and the genres feel more defined by the fandom's general vibe than any specific romance or high-drama tropes. The crossover potential is huge, though, since his content touches so many games.