My wife and I have played through Pokemon sword/shield and scarlet/violet together. Her first completed game and platinum trophy was It Takes Two, and that was a very special game to play through together. Highly recommend. We also played through Diablo 4 together. She loves coop rail shooters in the arcades, Carto, Hogwarts Legacy, Two Point Hospital, and Trine. We've played tons of games, like Mario, Wow, Destiny 2, Borderlands, final fantasy14, and she kicked my ass in Tekken and Dragonball FighterZ(as she gave me an "oh yeah, I used to play Tekken all the time 😂) . But she'll still say games arent her thing 🙃 lol
My suggestions would be: Diablo3(witch doctor) or diablo 4(necromancer), It Takes Two, Overcooked, Borderlands 2(Gaige), Trine series, and if both of you can do it without taking it personally, fighting games like mortal kombat and street fighter is always fun to just button mash and see what happens. Pokemon was priceless watching her reactions to every new pokemon she discovered, and the tactics she came up with to win(if you cant beat'em, use Toxic and spam potions 😂). Its not true coop, though.