Jakob's favourite outfit is "whatever he's wearing at the moment", though he has a denim cap he refuses to take off, ever. If he could get away with it he'd wear it all the time. Even in formal settings, he'll try to put it back on.

His favourite cake is probably cheesecake, since it's thick and heavy and uncomplicated, like him!

Favorite video game? I don't think he has a particular preference other than the one that gives him the most instant gratification. He doesn't have the patience for the long game.