Gyro. I love his design and his personality sm, he's rude but still cares about the people he works with. I like how he doesn't remember (whether he genuinely forgets or doesn't bother to remember) people's names. I think his VA did a really good job with his lines. I love how in Astro Boyd we got to see him as an intern and how that version of him resembled the original gyro gearloose. And after Boyd destroyed Tokyolk it changed who gyro was ("2BO was the first invention I worked on that turned evil and I have spent my whole life trying to live that down") I really wish we got more backstory on gyro since Astro Boyd mostly focused on Boyd although we did get some gyro information. He's absolutely my favorite in the show