Digimon Tamer in Marvel

Ethan Kepler was just another light novel author with a penchant for video games... until a heart attack sent him spiraling into the afterlife. But instead of pearly gates, he wakes up in a grimy room in Queens, reborn in the Marvel Universe! Talk about a cosmic lottery ticket to the most dangerous place imaginable. Now, armed with a mysterious "Digimon System" and partnered with Gatomon and BlackGatomon, Ethan has the chance to survive in a world of super soldiers, genius billionaires, and literal gods. But with great power comes great responsibility... and crushing student loan debt. As he navigates a world teeming with iconic heroes and villains, Ethan must master his newfound abilities to protect himself and those around him. Can he become the ultimate Digimon Tamer, or will he become another casualty in the never-ending battle between good and evil? — Description from novelcodex.org