Probably Galaga or Mrs. Pacman. They were in a combo arcade cabinet at the YMCA I visited. It also may have been Sonic 2006 as they had an xbox there too.
I'm not sure exactly. Most likely a supermarket arcade machine like Pac-Man or Centipede. But my first console game was Duck Hunt. My friend's mom wouldn't let us play Mario at first because she said it was too hard. But we could totally shoot pixel ducks dead with a plastic gun big enough to shoot a barn door off at 40 paces.
I imagine it would be boring as hell now, but I loved it when I was little. I think I played 10 Little Robots and Dinosaur Discovery Kit aon the Amiga around the same time.
First console was my parents old Atari 2600. First game was either Frogger, Pac Man, Asteroids, or Burger Time which was my Moms favorite. Played a lot of Adventure too, though those duck dragons scared the hell out of me as a child.
Just because I have to remind myself of how old I'm getting, my first game may have actually been the Atari ET game. Or, potentially, the Journey shooter game. They were in my first five games, it was a long time ago and I don't quite remember.