Must-play PS5 games for someone new to PlayStation?

I'd put Demon's Souls on that list if you want something to show off the console, and It Takes Two if you've got someone to play with. And check what's in PS Plus Extra before buying anything, a few of the big ones end up in the catalogue.

Astro Bot first, it's basically a tour of what the DualSense can do and it's just fun. Then Spider-Man 2, Ratchet & Clank: Rift Apart, Ghost of Tsushima and God of War Ragnarok (play the 2018 one first if you care about the story). If you like something harder, Returnal.