So, I have recently been watching a lot of anime with my son, Haywire3, including season 1 of Pokemon, 2004 Tetsujin 28, 80s Shin Tetsujin 28, 60s Gigantor, and took a sidestep for an episode of Megas XLR which led to hunting down Star Blazers: Quest for Iscandar, all of which he has really loved. He's also seen Speed Racer, Porco Rosso, My Neighbor Totoro, and Laputa.
He IS 5-1/2, and a little sensitive about people dying (sort of), so we haven't tried Macross/Robotech or some of the other Ghibli films, and it will be quite some time before I let him watch City Hunter, Cowboy Bebop, Trigun, Space Adventure Cobra or similar shows, but I'm kind of wondering what other classic anime I can introduce him to? Thinking about Astro Boy, which I've never seen myself, and Patlabor (though I hate the dub), mayyyybe Irresponsible Captain Tylor (it's kind of borderline). Anyone have any suggestions?
Voltron, if you go with the dub, which cuts out much of the death and presents the monsters as robots, thou the vehicle series has the monsters that are truly machines, if you choose to watch the 80s series, you could go for Samuari Pizza Cats as well