I watched one Japanese cartoon once in my childhood. There was a flying robots flying killing everybody. Do you know its's name? I always wanted to rewatch it,

I watched one Japanese cartoon once in my childhood. There was a flying robots flying killing everybody. Do you know its's name? I always wanted to rewatch it, but have no idea what's its name. I'm trying to piece together what I watched in childhood. Since a few years ago, people who are more into cartoons cued me on that: Blue alien who shoots lasers from its bra is Guyver, and that it's not an alien, and is a guy. A communist coup in space is Ryvius, and on a closer look, communists were actually high class cadets with parents in high up places, and not the other way around.