>>23304598>Amuro originally build Haro because he's a NEET sperg, he then sold the patent for mad bucks after the OYW, which led to it becoming a common toy.Other way around. Haro was the mascot of the Colony Public Corporation (CPC) - the organisation in charge of building and maintaining the Universal Century's space colonies. A mascot character toy with rudimentary AI interaction was available for purchase to consumers - similar to how we have stuff like talking dolls of kids' TV-show characters.
It was popular among undergrad engineering students to mod these because they were easily accessible and affordable in case of permanent fuck-ups, but still challenging and rewarding to mess around with. Amuro bought one to tinker on intent on passing it to Fraw as a gift. He managed to improve its AI and installed manipulator arms on it by the time the OYW hit their colony and they were forced into the war, after which Amuro had precious little time to bother continue modding his Haro.
Kamille acquires a broken down mass-produced Mk II revised Haro later in Zeta Gundam, which he suspects is actually the original. He repairs it; only for the thing to continuously address him as "Amuro" - which means he was either correct; or whoever started mass-producing them again after the OYW had a very strange sense of humor to themselves.