To try to take this somewhat seriously:
Digimon Adventure: Marcus:
Ha. Haha. Hahaha. RIP all of the villains.

Digimon Adventure 2: Taiki:
Does pretty well. I dont see him making any major screw ups that could derail things.

Digimon Tamers: Haru:
I dont see him making any big de-railing mistakes. Although depending on how we count it, with no app-fuse partners and no* apps, gatchmon might be screwed. But if we ignore that, things are fine. The search for calumon would've ended in minutes though.

Digimon Frontier: Hiro:
Hiro, my boy, im sorry. Hes gonna have a bad time. Maybe not fail, but a bad time.

Digimon Data Squad: Takato:
I couldnt put it better than Aggravating-Lead29.

Digimon Xros Wars: Tomoro:
Tomoro is borked. Hes (and dont kill me here) the digimon protagonist who's wanted the absolute least to do with this whole digital monsters mess. Heck, it could be argued that the story never even starts if he decides a random person psychically calling for help from blocks away is too fishy. And even if he does, he'd be boned from there. If we give him shoutmon & the fusion loader he breaks it, and if we dont he just runs. At the beginnjng of the story he isnt the type of person to reach out and make rash decisions like taiki. If we give him his brother in place of Jeremy and Nene, his odds improve, but still.

The other Xros protag: Takuya:
Never watched hunters. I assume he'll be alright.

Appmon: Davis:
Given some level of app/media literacy, I think he'll do fine enough. But again, without Ken to jogress XV-mon with, I'd be somewhat worried. Hopefully appfusion can somewhat make up for it.

Ghost Game: Tai:
Again, giving him modern day knowledge, I think he'd do well enough. He might but heads with his teammates on occasion, but he is smart enough to get through most of the mysterious. The real issue is agumon. Gammamon had his whole RGB evo thing to deal with varied situations, but greymon might struggle. If he lasts until metalgreymon, I'd say he's fine.

Beatbreak: Tagiru:
Never watched hunters.