I would love a series that has all of astro's siblings or at least the show versions.
Atlas 80s kid version: I loved him being astro boy's twin, and I just love his design in the 80s series, orange bronze skin and blonde hair work great together, the little robot with anger and the desire to protect robots from humans with far less limits yet wants astro to join him. Oh, and Livian should be involved. I like Atlas having his Lazer eyes, boosters, and butt machine guns as opposed to astro having the arm cannon instead of Lazer eyes. Implying that Atlas's creators couldn't recreate the arm canon. Atlas also has his electric sword, and I imagine this version of Astro also having his digit beam and Astro being able to make a shield by spinning with his arm cannon. Atlas is interesting, and he and Livian are adorable. I like this version remaining a kid and being considered Astro's twin. Atlas and Livian definitely care for each other, with Livian's kindness preventing Atlas from going even farther down a dark path. She is basically his light. Astro Boy, Atlas, and Astro Kitty likely have other abilities, too. Also, I like Atlas's look because despite him being a kid, he looks like a mythical figure, which works great considering he was built to be the evil ruler of humankind. Which is kinda ironic considering he grows to hate humans and wants to free robots showing some goodness despite his creators wishes
Reno from Astro Boy 2003: I adore Reno's backstory of being a human kid raised by a robot circus that gets adopted by the Astro family because the circus doesn't want Reno to get hurt or tooken into the foster system. This tan kid is very agile and flexible and able to scale buildings by swinging around and doing acrobatics. Don't underestimate this eleven year old little boy. He is also very smart and understanding the mechanics of so many robots. Reno is a kind kid to humans and especially robots, although he can occasionally show off, especially when it comes to his tricks he picked up from the circus, saying that he was raised in a robot circus while he escapes using whatever he needs to. I just wish he had a weapon to help with fighting, like a suit and a bow staff as that would work great with his acrobatics. He is interesting and has cute scenes with Astro and other characters. I imagine him wanting to befriend Atlas despite Atlas's hatred towards. Reno has helped fix Astro constantly
Astro Kitty Go Astro Boy Go version: This blue robo anthro Kitty is adorable but hotheaded at times. He loves playing and looks up to Astro. He struggles with pronouncing some words and will choose a different word to use. With how playful he is, he is occasionally going to get himself into trouble. Despite being perfectly capable of talking, i like him occasionally purring and meowing and sitting on things like a normal cat sometimes. He and Uran definitely occasionally get into arguments. He has his titanium claws, bouncy ball blaster. i imagine those aren't actually bouncing balls, but he can't say what they are actually called, so he just calls them bouncy balls. He also has boosters just like Astro and Atlas, oh and he has the mallet because I like it, so if his back opens up, there is going to be a mechanical arm with a mallet coming out. And his tail being able to spin around enough he can hover.
Uran just in general: Uran is the little sister of the family, but do not underestimate her. This girl may occasionally be girly, but she is very much a tomboy and is not afraid to fight. Despite not having fancy gadgets, she still has super strength, I like the idea of her being the strongest when it comes to super strength, thanks to her power source not having to focus on gadgets.
Astro, Reno, Kitty, and Uran do definitely get into trouble occasionally. And Atlas causes trouble for humans at least and has probably gotten into trouble and likely needed the rest of his family's help, even if he doesn't want it. Plus, Livian has no problem contacting Astro and thinks he is a good kid. These siblings would be amazing to watch a show about with all of them.