Both are robots designed as boys and both are specially made, both desire to and were made to close the difference gap between humans and robots, both have dogs and a family, and both dislike having to fight other robots to attain peace time and again.

Astro Boy was created to replace Dr. Tenma's deceased son but was designed to be invulnerable and given 7 super powers so he would never break. Dr. Tenma however disowned him and called him an abomination because he could never be a real son because robots do not grow. Astro was sold to a circus owner and made to perform inhumane acts for entertainment until Prof. Onichomizu asked the circus owner to turn Astro over to him because he was a crowning achievement in robotics, and the acts he was made to perform violated robot laws of cruelty.

When robots were granted the same rights as humans Astro was set free and put in the custody of Prof. Onichomizu. Onichomizu taught Astro right from wrong and watched over him as his surrogate father and made him attend school. He even made him a family with two robot parents and a little sister named Uran, and later, a brother named Cobalt. Astro even inherited Tenma's son's dog Jump. Aside from fighting evil men and robots programmed to do evil or gone haywire and the odd alien threat, Astro's biggest fight was against discrimination and for equality for all robots.

Astro Boy was created by Dr. Osamu Tezuka in 1951, then known as Tetsuwan Atom (Mighty Atom), for his stint at Shonen magazine. He was the star of the long running Manga and the very first Anime to be broadcast outside Japan. Every manga creator owes their creativity to and were heavily influenced by this legendary creator, who wrote from the heart and whose timeless creation continues to be enjoyed by each new generation.

Mega Man was created as Rock, one half of two robot housekeepers created by Dr. Thomas Light in the year 200X. Rock and his twin sister Roll were created along with 6 other worker robots made to benefit mankind. But Dr. Light's assistant Dr. Albert Wily had machinations on Light's robots for world domination and reprogrammed them to serve him. Dr. Light didn't know what to do until his 'son' Rock volunteered to be converted into a fighting robot to end Dr. Wily's reign of terror. Thus, the super robot Mega Man was born.

Mega Man was given a Mega Buster arm cannon and a re-enforced titanium blue suit of armor, and succeeded by destroying his brothers and inheriting each of their powers with each victory. Dr. Wily however never gave up on world domination, or on revenge, and sent 8 robot masters with new powers after Mega Man time and again. Either through manipulation of events from behind the scenes or by outright attacking himself.

In later adventures Mega Man was given a robot dog named Rush who helps him with various transformations. He also discovered he had an older brother named Proto Man who disappeared from Dr. Light,s lab years ago who returned to lend him support or test his strength on occasion, and given a crime-fighting bird named Beat. Along with his sister and 'father' and his lab assistant Auto they are all one big happy family.

Mega Man was created in 1987 by game designer Keiji Inafune in an attempt to create Capcom's newest star and mascot. The character underwent several revisions until becoming known as Rockman (the core gameplay having a rock, paper, scissor element) but also for Inafune's love of music (hence the names of some characters). When released outside Japan he was called Mega Man. The game was so popular that many sequels were released followed by several spin-offs. It's no lie that he was influenced, if not based, on Astro Boy