Light hearted easy games that I would play would be things like:
Overcooked
Stardew Valley
Castle Crashers
Fall Guys
Crystal Crisis
My reasoning would be that they’re mostly (other than Stardew Valley) are quick and easy games. Not knowing what the other person is really into any more, it might be just an easy way to dip toes into the water.
Mobile games wise, while I don’t play many, I would recommend: